On this page
UnderstandWhat it is, what people ask, how far this page goes
Natural inorganic gem materials · Rock / mineral aggregate · Natural identity; treatment status unknown
Petrified Wood
Also known asFossil wood · Silicified Wood
A fossil material in which wood has been replaced mainly by Chalcedony or Quartz; GB/T 16552—2017 Table A.2 groups it under the "Silicified Jade" row, and it is not a single mineral. Also known as Fossil wood, Silicified Wood. This page compares how the major standards and institutions name it, what must be disclosed when selling it, whether it can be worn every day, how it is treated and identified, and which source each conclusion comes from.
Price, rarity and origin are outside the scope of this wiki.
What this page can answer
This page covers
- How Petrified Wood forms and what gives its colourFormation setting, process and timescale, each finding graded and sourced
- Treatments and enhancements of Petrified WoodThe enhancements and treatments the GB/T and JJA/AGL tables list
- Caring for and wearing Petrified WoodCleaning, heat, chemicals and light, as the cited sources give them
- Hardness, density and refractive index of Petrified WoodEach value with its source and check date
- Petrified Wood in English, Chinese and Japanese; national standard namesNames in four languages, the GB/T standard name and the suggested listing name; and: Has any of GIA, FTC, CIBJO or Gem-A put a name for it on record here?
- Listing and disclosing Petrified WoodThe listing name to use; what must be disclosed before sale
- Standard clauses that define Petrified WoodWhich clause defines it, each cross-checked
What we cannot conclude
- Whether one particular bead is natural, treated or synthetic — only a laboratory report can settle that.
- Geographic origin, unless an origin report accompanies the item.
- Price, rarity or investment value: this wiki covers naming and disclosure only.
Material research: formation, causes and history
What authoritative sources say about how this material forms, what causes its colour and optical effects, where its name comes from and how people have used it. Each statement carries an evidence grade and its sources; it describes the material in general, not any specific piece.
How it forms
Petrified wood is wood preserved by petrification, chiefly through permineralization and/or replacement. Groundwater containing silica or other ions flows through the small pores of buried wood, causing dissolved ions to precipitate and infill the pores as a three-dimensional internal mold that retains the original shape. Replacement substitutes inorganic minerals for the dissolved original hard parts, changing the mineralogy. Because volcanic ash supplies silica readily, silicification is the commonest type, and the silica may appear as chalcedony, quartz or opal.
Scope: Covers the petrifaction and preservation of buried wood in silica-rich groundwater environments; the prevalence of silicification applies especially to sedimentary strata associated with volcanic ash and volcanic mudflows (lahars).
Sources NPS Permineralization · NPS Volcanoes and Fossils
Where it forms
Volcanic-ash-bearing sedimentary strata and lahar (volcanic mudflow) deposits, where ash supplies abundant silica that promotes wood silicification.
Sources NPS Permineralization · NPS Volcanoes and Fossils
Fluvial depositional settings, where logs were transported by streams and quickly buried by river sediment.
Sources NPS Permineralization · NPS Volcanoes and Fossils
How it forms, step by step
Wood is quickly buried by sediment, volcanic ash, or a lahar, isolating it from decay.
Sources NPS Volcanoes and Fossils · NPS Permineralization
Groundwater containing silica (or other ions) flows through the small pores of the buried wood, and the chemical environment created by the organic material causes dissolved ions to precipitate out of solution.
Sources NPS Permineralization
Silica infills the pores, forming a three-dimensional internal mold that retains the original tissue shape (sometimes at the cellular level) — permineralization.
Sources NPS Permineralization
In some specimens, inorganic minerals substitute for the dissolved woody hard parts — replacement — changing the mineralogy.
Sources NPS Permineralization
Permineralization and replacement act together, ultimately producing denser, heavier petrified wood than the original material.
Sources NPS Volcanoes and Fossils · NPS Permineralization
Link to appearance
Permineralization preserves the original woody form as a three-dimensional internal mold; because pores are filled with silica or other minerals, petrified wood is denser and heavier than the original organic material, and the reddish colors come mainly from small amounts of iron and manganese minerals.
Sources NPS Permineralization
Timescale
Several examples can be dated: the Chinle Formation was laid down roughly 227–205 million years ago; lahars buried the Florissant trees about 34 million years ago; and the Clarno nut beds are some 44 million years old.
Sources NPS Permineralization · NPS Volcanoes and Fossils
Related base materials
- Wood (original organic tissue): Petrified wood forms when the pores of buried wood are filled with silica and/or the woody tissue is replaced by silica
Supporting findings
In permineralization, minerals dissolved in groundwater fill the natural pores of buried wood, producing a three-dimensional internal mould.
Evidence grade BScope: This definition comes from a National Park Service interpretive article intended as a general explanation of fossil preservation.
Sources NPS Permineralization
In replacement, inorganic minerals take the place of the original hard parts as these dissolve, so the mineral make-up of those parts changes.
Evidence grade BScope: This definition distinguishes replacement from recrystallization, which involves minerals of the same chemical composition.
Sources NPS Permineralization
Petrified wood is most commonly found in lahar deposits and ash-bearing sediments, where volcanic ash provides the silica that drives permineralization and replacement.
Evidence grade BScope: This generalization rests on U.S. National Park Service examples and may not cover all petrified-wood localities.
Sources NPS Volcanoes and Fossils
Several petrified-wood occurrences are numerically dated: the Chinle Formation about 227-205 million years ago, the Clarno nut beds about 44 million years ago, and Florissant about 34 million years ago.
Evidence grade BScope: These ages pertain to specific formations and sections and do not represent all petrified wood.
Sources NPS Permineralization · NPS Volcanoes and Fossils
Recorded localities
Authoritative sources list the localities below; the list is not exhaustive.
North America
- Petrified Forest National Park and surrounding region, Arizona, United StatesProtected within the national park; not a mining source
Sources NPS Petrified Forest
These are localities recorded by authoritative sources, not an origin finding for any individual piece. The CIBJO Gemstone Book (2022, §4.2.3) says a place of origin names where a gem was mined or harvested, is a matter of opinion, does not imply a level of quality, and that cutting, processing or exporting centres must not be used to imply origin. See the origin determination guide and the overview of recorded localities.
Other research findings
The commonest form of permineralization and replacement is silicification, especially in fossil wood and bone; the silica involved may be chalcedony, quartz or opal, and volcanic ash provides an abundant silica source.
Evidence grade BScope: This is a general overview; the specific silica phase varies with locality and fluid conditions.
Sources NPS Permineralization
Limits of this research
- Research status: Formation, occurrence or other material-specific findings found in authoritative sources
- The cited sources are National Park Service interpretive articles and give no quantitative estimate of petrification rates.
- The specific silica phase and silica source vary by locality, and the sources rely mainly on U.S. national-park examples.
Methodology
- Origin determination and its limits
- Quality grading and value factors
- How gemmology became a technical discipline
Evidence grades
- A
- Standards bodies, government geological surveys, peer-reviewed research and museum records
- B
- Institutional educational material
- C
- Specialist databases or cautious readings
A statement is never graded above its strongest source.
This section is LumaLark's own factual restatement of public authoritative sources, credited item by item; it contains no verbatim excerpts, images or third-party logos.
DecideListing name, disclosure, care and treatments
- Suggested listing name
- Petrified Wood
GB/T 16552—2017 Table A.2 “Silicified Jade(Silicified Asbestos/ Silicified Wood/ Silicified Coral)” · CIBJO Gemmological Laboratories Book 2024 §7.2.1.175 “Petrified wood (silicified wood)”
Construction or treatment status
Natural identity; treatment status unknown
Treatments recorded for this material: Dyed, Filled / Fracture-filled
Related:Disclosure and cautions
This page cannot answer
Natural? · Origin · Price
A lab report settles these; this wiki covers naming and disclosure.
Related:What this page can answer
Answer at a glance
"Petrified Wood" is a market name rather than a mineral species name; before using it, verify: Industry-wide term that does not denote a single species.
What this means for you
Before buying, check the recommended listing name "Petrified Wood" and any disclosed treatments on this page, and ask the seller for a grading report if in doubt.
Known uncertainty
- This entry's exact material identity is not fully settled.
- See “Disclosure and cautions” above
- Last reviewed
- 2026-09-01
Trade-name ruling
- Industry-wide term that does not denote a single species.
- Suggested listing name
- Petrified Wood
Care and wear
Care
Petrified Wood — care (light): the authors rank water control as the key conservation issue for these fossil forests, listing rain, flooding, damp ground and direct sun as things to keep away from the logs (field setting).
Geosciences (Mustoe et al., 2022)
- Treatment state
- any treatment state
Source & check 2026-10-06
- Source
- Fact checked on
- 2026-10-06
Petrified Wood — care (chemicals): the study stresses that consolidants, glues and water-repellent coatings cannot stand in for proper environmental control; at best they slow decay rather than restore the wood.
Geosciences (Mustoe et al., 2022)
- Treatment state
- any treatment state
Source & check 2026-10-06
- Source
- Fact checked on
- 2026-10-06
care (storage)2 sources compared
Petrified Wood — care (storage): The NPS curatorial handbook advises that big cut sections of fossil logs may each need a dedicated pallet to bear their weight, moved with a pallet jack.
NPS Museum Handbook, Appendix U
- Treatment state
- any treatment state
Source & check 2026-10-06
- Source
- National Park Service, Museum Handbook Part I, Appendix U: Curatorial Care of Paleontological and Geological Collections (2005): p.U:10, body text (locator checked 2026-10-06)
- Fact checked on
- 2026-10-06
Petrified Wood — care (storage): For fossil trunks in a tropical climate, the study recommends shelters that limit swings in temperature and limit contact with moisture; even indoor display carries possible risks: the authors note that air-conditioned rooms can be drier than the specimens' natural surroundings (the resulting damage is not specified).
Geosciences (Mustoe et al., 2022)
- Treatment state
- any treatment state
Source & check 2026-10-06
- Source
- G. Mustoe, C. Aranyanark, N. Boonchai & P. Jintasakul, “A New Look at Cenozoic Fossil Wood from Thailand”, Geosciences 12(8): 291 (2022) (archived excerpt: pp. 1, 23, 24, 30, 31 of the article file): pp. 30, 31, body text (locator checked 2026-10-06)
- Fact checked on
- 2026-10-06
Petrified Wood — care (wear): a peer-reviewed study reports that where silicified wood is incompletely mineralized, water can get in and carry clays, iron oxides and soluble salts that may stain and degrade it (based on large in-situ logs in Thailand).
Geosciences (Mustoe et al., 2022)
- Treatment state
- any treatment state
Source & check 2026-10-06
- Source
- Fact checked on
- 2026-10-06
Each row's “Source & check” expands to the full source; the date beside it is the fact check date.
Common care questions and matching entries
Each question links to the matching entries on this page; whether they answer it fully, go by the entry wording.
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Treatments and identification leads
One row per treatment, with three standards side by side: how often it occurs and how stable it is (CIBJO), its category in GB/T 16552—2017 Table B.1 (this site's paraphrase) and how the JJA/AGL 2025 table lists it. Each CIBJO value links to its entry under “Testing and market”, where the wording and source are given in full.
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| Treatment | Market frequency (CIBJO) | Stability (CIBJO) | GB/T 16552 category | JJA/AGL listing | Identification leads |
|---|---|---|---|---|---|
| Dyeing | — | — | Treatment | — | — |
| Filling | — | — | Graded — see §5.4.1, Table 1 | — | — |
“—” means the cited source gives no value for that item, not “none”. Source: GB/T 16552—2017 Table B.1 (row for Silicified Jade)
Whether a treatment has to show in the name differs between the two rule sets (this site’s paraphrase):
- GB/T 16552—2017: a method classed as treatment has to be stated in the name itself — the method put before the name, or added in brackets after it; a method classed as optimization does not need to appear in the name, though one marked “Optimization (annotation required)” still has to be noted in the quality documents. Source: §5.4.2.1 a), b); §5.4.2.2 a)
- CIBJO Gemstone Book 2022: no longer splits treatments into ones that need specific disclosure and ones that need only general disclosure: every treatment is to be disclosed, and the seller tells the buyer which treatment was used and what special care it calls for. Source: §4.2.5 Note 2, §4.2.5.1, pp.14–15
VerifyNames, standards, technical facts, clauses and sources
Names
Besides Petrified Wood, the name register records "Fossil wood" and "Silicified Wood", for which no restriction on use as a name is recorded (GB/T 16552—2017 Table A.2 “Silicified Jade(Silicified Asbestos/ Silicified Wood/ Silicified Coral)”; CIBJO Gemstone Book 2022 Annex 8 “Silicified Wood”); one further name in a non-Latin script is listed in the name register below (1 that may appear only as an annotation, never as the product name).
Name register
Every name recorded for this entry, with how it is classified, whether it may be matched to this entry automatically, whether it may be used as a product name, and the clause it rests on.
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| Name | Type | Matching | Use as a name | Basis |
|---|---|---|---|---|
| no restriction recorded (2) | ||||
| Fossil woodEnglish | market name | matched automatically | no restriction recorded | editorial ruling (no clause cited) |
| Silicified WoodEnglish | synonym | matched automatically | no restriction recorded | GB/T 16552—2017 Table A.2 “Silicified Jade(Silicified Asbestos/ Silicified Wood/ Silicified Coral)”; CIBJO Gemstone Book 2022 Annex 8 “Silicified Wood” |
| annotation only, never as the product name (1) | ||||
| 树化玉Simplified Chinese | market name | matched automatically | annotation only, never as the product name | GB/T 34098—2017 Table A.1; GB/T 34098—2017 §6 b) |
How each authority words this name: see Names › Authority wording.
- GSJ (Japan) formal name
- 珪化木 (not yet checked for this body — the entry's own Japanese name is shown)
- Chinese formal name
- 硅化木 (GB/T 16552—2017 Table A.2, row “Silicified Jade(Silicified Asbestos/ Silicified Wood/ Silicified Coral)”)
- Mineralogical name
- Fossil wood replaced chiefly by chalcedony/quartz
- Trade names and synonyms
- Fossil wood (market name) · Silicified Wood (synonym)
Four-language names
- 简体中文
- 硅化木
- 繁體中文
- 矽化木
- English
- Petrified Wood
- 日本語
- 珪化木
GB/T 34098 trade names
GB/T 34098-2017 Table A.1 lists on the silicified wood row: 树化玉 Shuhua Yu (not mentioned in the body text of clause 5.6).
The full table and naming rule are on the Quartzose Jade page.
See also: Misleading and prohibited trade names · Supplementary name index
Classification
- Origin
- Natural materials
- Material domain
- Natural inorganic gem materials
- Browsing family
- Fossil and mineralized materials
- Identity tier
- Rock / mineral aggregate
- Mineral chemical class
- Mixed / composition-dependent
- Construction or treatment status
- Natural identity; treatment status unknown
Treatments listed by standards
The “Silicified jade (silicified asbestos/petrified wood/silicified coral)” row of GB/T 16552—2017 Annex B, Table B.1 lists dyeing and filling for Petrified Wood: dyeing improves or changes colour and is classed as treatment; filling improves or changes durability and appearance and is classed by grades, which are defined on the Gem treatments page. What Table B.1 notes is explained on the Gem treatments page.
GB/T 16552-2017, Annex B, Table B.1
Table B.1, row “Silicified Jade (Silicified Asbestos/Silicified Wood/Silicified Coral)” (p.16):
This table scrolls sideways on narrow screens.
| Method | Effect | Category |
|---|---|---|
| Dyeing | Improves or changes colour | Treatment |
| Filling | Improves or changes durability and appearance | Graded — see §5.4.1, Table 1 |
What Table B.1 is, and how the “see 5.4.1” grades are defined: see the GB/T 16552: optimization vs treatment page.
What it is and how it's identified
The phase composition of Petrified Wood is quartz, and the organic matter it contains consists of compounds of C and H; silica replaces the wood to form a quartz aggregate, ranging from cryptocrystalline to phanerocrystalline, with a granular or fibrous structure in which wood grain, bark, knots and insect borings can be seen. Taking the values of the clause for silicified jade (including silicified asbestos, petrified wood and silicified coral, the whole class), not data measured separately for Petrified Wood, the Mohs hardness of Petrified Wood is 5–7, there is no cleavage, density is 2.48–2.85 g/cm³, optic character is anisotropic aggregate, refractive index is 1.544–1.553, and birefringence is not measurable in aggregates. This site notes that the clause gives finer bands for refractive index and the overall value is taken. Pleochroism when untreated is not measurable in aggregates, also taken for silicified jade as a whole class. When untreated, Petrified Wood usually shows vitreous lustre on polished surfaces and waxy lustre on fracture surfaces, sometimes greasy lustre.
Registered material facts
Each row carries its own source and check date and can be cited on its own; “—” means the cited source gives no value, not “none”.
Chemical composition, luminescence, UV-visible spectrum, infrared spectrum, magnification: these whole-class features are given in the cited clause for silicified jade (the whole class), so they are not repeated on the Petrified Wood page; see the material facts on the Silicified Jade entry.
Items below that name the class they cover give the cited clause’s value for that whole class, not a measurement of Petrified Wood (how to read class-level values).
Definition
Petrified Wood — composition (chemistry): The organic matter in petrified wood consists of compounds of carbon and hydrogen.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.2.6 Chemical composition · Petrified wood (locator checked 2026-09-28)
- Fact checked on
- 2026-09-26
Petrified Wood — composition (phase): quartz
CIBJO Gemmological Laboratories Book 2024
Source & check 2026-09-22
- Source
- Fact checked on
- 2026-09-22
Structure
structure (overall)2 sources compared
Petrified Wood — structure (overall): a cryptocrystalline to phanerocrystalline quartz aggregate formed where silica has replaced wood. The texture is granular and fibrous, and wood grain, bark, knots and borings can be seen.
GB/T 34098—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-17
- Source
- GB/T 34098—2017 Quartzose jade — Classification and nomenclature (GB/T): §5.6 (locator checked 2026-09-17)
- Fact checked on
- 2026-09-17
Petrified Wood — structure (overall): crystalline aggregate
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- silicified jade (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.2.6 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Durability
Petrified Wood — Mohs hardness: 5–7
GB/T 16553—2017
Reference points on this site: Talc 1–3, Fluorite 4, Apatite 5–5.5, Orthoclase 6–6.5, Topaz 8, Diamond 10 (Source: GB/T 16553—2017); Gypsum 1.5–2, Calcite 3, Quartz 7 (Source: Handbook of Mineralogy); Corundum 9 (Source: GIA Gem Encyclopedia (care guide))
- Does this standard apply
- applies to this entry
- What this covers
- silicified jade (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.2.6 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Petrified Wood — cleavage: none
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- silicified jade (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.2.6 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Physical properties
Petrified Wood — density: 2.48–2.85 g/cm³
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- silicified jade (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.2.6 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Optical
Petrified Wood — optic character: anisotropic aggregate
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- silicified jade (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.2.6 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Petrified Wood — refractive index: 1.544–1.553
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- silicified jade (the whole class)
- General note
- the clause has finer ranges
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.2.6 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Petrified Wood — birefringence: not measurable on an aggregate
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- silicified jade (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.2.6 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Petrified Wood — pleochroism: not measurable on an aggregate
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- What this covers
- silicified jade (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.2.6 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Petrified Wood — optical effect (chatoyancy): seen
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- silicified jade (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.2.6 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Petrified Wood — body colour: light yellow to yellow, brownish yellow, brownish red, greyish white, greyish black and other colours.
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- Qualification
In chapter 5 of GB/T 16553—2017, the colour entries of Chicken-blood Stone, Shoushan Stone, Rhodochrosite and other variety clauses also name yellow or a yellowish colour.
- General note
- colour alone is not identity
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.2.6 Colour · Petrified wood (locator checked 2026-09-28)
- Fact checked on
- 2026-09-26
Petrified Wood — common colours: yellowish brown, brownish red, greyish white, greyish black and similar colours.
GB/T 34098—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- Qualification
Among the quartzose jade varieties in GB/T 34098—2017, Silicified Asbestos and Silicified Coral / Fossil Coral also name brown or a brownish colour among their common colours; the standard separates these varieties by crystallinity and by whether they show silica-replacement pseudomorphs.
- General note
- colour alone is not identity
Source & check 2026-09-26
- Source
- GB/T 34098—2017 Quartzose jade — Classification and nomenclature (GB/T): §5.6 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
- CIBJO definitions
- chatoyancy
Quality factors
quality factor (lustre)2 sources compared
Petrified Wood — quality factor (lustre): Polished surfaces commonly show a vitreous luster. Fracture surfaces commonly show a waxy luster, and a greasy luster may sometimes be seen.
GB/T 34098—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
Source & check 2026-09-20
- Source
- GB/T 34098—2017 Quartzose jade — Classification and nomenclature (GB/T): §5.6 (locator checked 2026-09-17)
- Fact checked on
- 2026-09-20
Petrified Wood — quality factor (lustre): vitreous; greasy or waxy on the fracture; silicified asbestos may also show a silky luster.
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- What this covers
- silicified jade (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.2.6 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Each row's “Source & check” expands to the full source; the date beside it is the fact check date.
This material (RI / SG midpoints): 1.548 / 2.67; Closest values: 1Agate 1.537 / 2.63, 2Shoushan Stone 1.56 / 2.7, 3Changhua Stone 1.56 / 2.6, 4Bamboo Coral 1.57 / 2.65, 5Synthetic Beryl 1.57 / 2.69
Show the full chart (330 registered materials)
Outside the full chart's range, drawn as triangles at the edge (RI / SG midpoints): Hematite 3.045/5.12, Synthetic Rutile 2.76/4.26, Rutile 2.753/4.23, Synthetic Moissanite 2.67/3.22
Clause-level definitions
Petrified Wood is defined directly in the CIBJO Gemmological Laboratories Book 2024 under the term “Petrified wood (silicified wood)”; the definition gives the mineral species as quartz and the mineral/gem variety as petrified wood, with the CIBJO wording quoted in full under Clause-level definitions on this page. The cross-check result is defined directly by CIBJO, with no English term of the same name found directly in the GB/T annex of this edition.
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| Term | Clause | Definition | Cross-check |
|---|---|---|---|
| Petrified wood (silicified wood) | 7.2.1.175 | Wood that has been replaced by chalcedony, with (partly) preservation of its original wood structure | Defined directly by CIBJO; no identically named English entry was found in this edition of the GB/T annex. |
Evidence and sources
Authority basis and clause sources
Sources
- CIBJO – The World Jewellery Confederation. Gemmological Laboratories Book (Blue Book), Gemmological Commission 2024-1.
- CIBJO – The World Jewellery Confederation. The Gemstone Book (Blue Book), 2022.
- SAMR / SAC (China). GB/T 16552—2017 Gems — Nomenclature.
- AQSIQ / SAC (China). GB/T 34098—2017 Quartzose jade — Classification and nomenclature.
Further reading
Related entries and topic cluster
Parent entry and related pages on this site. Rows marked “Planned” are suggested new content and have no link yet.
This table scrolls sideways on narrow screens.
| Page | Content | Status |
|---|---|---|
| Browsing family | Fossil and mineralized materials | Live |
| Treatments recorded for this material | Dyed, Filled / Fracture-filled | Live |
| Related articles | To be added (placeholder) | Planned |
Who maintains this page
The material facts in the Petrified Wood entry are maintained by the LumaLark wiki and matched one by one to the standard clauses or institutional sources they cite: every fact carries its source (with a clause or page locator) and a check date, so it can be traced back to the original; clause-level definitions also carry a cross-check result. The entry exists so that buyers and sellers can check naming, disclosure and material facts item by item.