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UnderstandWhat it is, what people ask, how far this page goes
Natural inorganic gem materials · Commercial / trade name · Natural identity; treatment status unknown
Elestial Quartz / Skeletal Quartz
Quartz with a skeletal, etched-looking growth habit; the Chinese name, meaning “skeleton”, describes the crystal habit rather than a mineral species, and neither CIBJO nor GB/T lists this name. 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 Elestial Quartz / Skeletal Quartz forms and what gives its colourFormation setting, process and timescale, each finding graded and sourced
- How to identify Elestial Quartz / Skeletal QuartzIdentification points from the research literature
- Treatments and enhancements of Elestial Quartz / Skeletal QuartzThe enhancements and treatments the GB/T and JJA/AGL tables list
- Hardness, density and refractive index of Elestial Quartz / Skeletal QuartzEach value with its source and check date
- Elestial Quartz / Skeletal Quartz 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 Elestial Quartz / Skeletal QuartzThe listing name to use; what must be disclosed before sale
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
'Skeletal quartz' (also termed etched quartz) is a name for a crystal habit/structure of quartz (SiO2): the crystals look skeletal—layered with split growth—or else show an uneven surface produced by etching. It is a descriptive habit term, not a separate mineral species. Two genuine processes account for the appearance. (1) Growth habit: quartz is known to develop 'artichoke' and 'cathedral' forms, and these consist of split, layered crystals that emerge where rhombohedral faces on a parent crystal open up; why this happens is not fully established, but impurity poisoning of growth faces that divides each rhombohedral face into several sub-faces may be responsible. (2) Etching after growth: once crystallisation has finished, invading fluids attack structural weaknesses first—twin boundaries among them—carving a ridge-and-valley relief and etch pits. The 'etched' appearance is thus a later surface modification of quartz, whereas the skeletal/layered look reflects the manner in which the crystal grew.
Scope: Used to explain the formation mechanism of the skeletal / etched habit of quartz (split, layered growth and later preferential etching); makes clear that the name is a habit description and the mineral species is quartz.
Sources G&G Spring 2017 · G&G Summer 2019
Where it forms
Quartz crystallisation settings (hydrothermal veins, geodes, etc.) in which crystals grow and develop layered/split growth forms.
Sources G&G Spring 2017
Post-growth fluid-etching setting: after growth, invasive fluids preferentially dissolve along defects, forming etch pits and valley-and-ridge surfaces.
Sources G&G Spring 2017
How it forms, step by step
Silica-bearing fluids crystallise quartz crystals.
Under certain conditions quartz grows in split, layered ('artichoke/cathedral') forms, with layered members emerging from the parent crystal's rhombohedral faces; the cause is not fully known and may involve poisoning of growth faces by impurities.
After growth, invasive fluids preferentially etch along structural defects (e.g. twin boundaries), sculpting a valley-and-ridge surface and etch pits to give the 'etched' appearance.
The skeletal/layered growth forms plus later etching give the crystal its 'skeletal' appearance, from which the market name derives.
Link to appearance
Crystals show a layered, split skeletal appearance, or surfaces with etch pits and valley-and-ridge texture; the former relates to growth style, the latter to later preferential etching.
Sources G&G Spring 2017 · G&G Summer 2019
Timescale
The source describes etching as a 'post-growth' event but gives no age or duration.
Sources G&G Spring 2017 · G&G Summer 2019
Related base materials
- Quartz (SiO2): habit-of | Elestial (skeletal) quartz is a description of a crystal habit (skeletal/etched) of quartz, not an independent mineral species
Supporting findings
After crystal growth, invasive fluids can preferentially etch quartz along structural defects such as twin boundaries, sculpting a valley-and-ridge surface and etch pits (the 'etched' appearance).
Evidence grade BScope: Established in a study of iridescent quartz; etching intensity may differ between localities.
Quartz can grow in split, layered ('artichoke/cathedral') forms; the cause is not fully known and may involve poisoning of growth faces by impurities, dividing the rhombohedral faces into multiple members.
Evidence grade BScope: The source describes macroscopic, millimetre-scale layered outgrowths and explicitly states the nanoscale periodicity is unclear.
Etching occurs preferentially at structural defects, so the etch features are oriented rather than randomly pitted.
Evidence grade BScope: Based on the established susceptibility of twin boundaries to preferential weathering plus this study's observations.
How it is identified
The colour and inclusion appearance of 'skeletal-quartz' cannot establish whether a stone is natural, synthetic or treated: quartz varieties that look alike may differ entirely in composition, growth history and treatment, and synthetic and natural quartz share essentially the same composition and physical properties, so the unaided eye cannot separate them. Laboratory identification rests on measurable properties and the division of labour between instruments — a polariscope with a conoscope lens can judge colour-zoning orientation from extinction and optic-axis readings, a refractometer gives refractive-index values, and EDXRF with infrared spectroscopy supplies chemical and structural fingerprints. Limitations: some methods depend on how the stone was cut and on comparison with reference material, and the final conclusion must be issued by an accredited gemological laboratory through testing rather than inferred from appearance.
Evidence grade AScope: Identification and separation points; testing must be performed by an accredited gemological laboratory, and no self-test thresholds are given.
Sources G&G Summer 2014 · CIBJO Gemstone Book 2022
Other research findings
'Skeletal quartz' describes a crystal habit/structure of quartz (SiO2) (skeletal/etched); it is not a distinct mineral species.
Evidence grade CScope: Defines the nature of the name only; the mineral species is quartz.
Limits of this research
- Research status: Formation, occurrence or other material-specific findings found in authoritative sources
- 'Skeletal quartz' is a habit/structure description, not a distinct mineral species; this record does not treat the market name as a mineral kind.
- The cited skeletal/etch mechanisms come from a study of iridescent quartz, not from research dedicated to skeletal quartz; the general mineralogical mechanism of skeletal habit by rapid growth is not covered by the cited sources.
- The sources give no absolute age or duration.
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
- Elestial quartz (quartz of skeletal habit)
IMA Mineral List 2026-07 “Quartz”
Construction or treatment status
Natural identity; treatment status unknown
Treatments recorded for this material: Heated / Heat-treated (via parent material), Irradiated (via parent material), Filled / Fracture-filled (via parent material), Dyed (via parent material), Coated (via parent material)
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
"Elestial Quartz / Skeletal Quartz" is a market name rather than a mineral species name; before using it, verify: Trade name rather than a mineralogical species name.
What this means for you
Before buying, check the recommended listing name "Elestial quartz (quartz of skeletal habit)" 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
- Trade name rather than a mineralogical species name.
- Suggested listing name
- Elestial quartz (quartz of skeletal habit)
Care and wear
No care facts are recorded for this entry itself. Its parent material has care records: see Quartz.
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.
This table scrolls sideways on narrow screens.
| Treatment | Market frequency (CIBJO) | Stability (CIBJO) | GB/T 16552 category | JJA/AGL listing | Identification leads |
|---|---|---|---|---|---|
| Heating | — | — | Optimization | — | — |
| Irradiation | — | — | Optimization | — | — |
| Filling | — | — | Graded — see §5.4.1, Table 1 | — | — |
| Dyeing | — | — | Treatment | — | — |
| Coating | — | — | Treatment | — | — |
“—” means the cited source gives no value for that item, not “none”. Source: GB/T 16552—2017 Table B.1 (row for Rock Crystal)
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
The name register below lists one name for Elestial Quartz / Skeletal Quartz in a non-Latin script: 1 with no restriction recorded on use as a name.
Chinese standard nameElestial Quartz / Skeletal Quartz is not included in GB/T 16552—2017; its naming counterpart in the standard is rock crystal, and the standard does not list this name. Trade and mineralogical namesThe mineralogical name is Quartz, describing quartz with a skeletal or etched growth habit; the name refers to crystal habit, not a distinct mineral species. It is also known by a market and trade name meaning golden elestial, in which golden is a colour modifier and the whole string is recorded as one name. Recommended listing nameThe suggested listing name is Elestial Quartz / Skeletal Quartz (quartz; a trade name for a crystal habit). Names in four languagesThe four-language names are the Simplified Chinese name, the Traditional Chinese name, the English name Elestial Quartz / Skeletal Quartz and the Japanese name. Trade and mineralogical namesThe IMA Mineral List includes Quartz; the CIBJO Gemmological Laboratories Book 2024 has neither Elestial nor Skeletal Quartz. Institution usageThe wording of GIA, FTC and Gem-A for this material is not yet verified by this site; Elestial Quartz / Skeletal Quartz is the entry's English name and does not represent the position of GIA, FTC or Gem-A. Japanese namesThe wording of GSJ (Japan) is likewise not yet verified by this site.
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.
This table scrolls sideways on narrow screens.
| Name | Type | Matching | Use as a name | Basis |
|---|---|---|---|---|
| no restriction recorded (1) | ||||
| 金骨干Simplified Chinese | market name | matched automatically | no restriction recorded | editorial ruling (no clause cited); Note: Product name; “gold” is a colour qualifier and the whole string is registered as one name. |
How each authority words this name: see Names › Authority wording.
- GSJ (Japan) formal name
- エレスチャルクォーツ（骸晶状の石英） (not yet checked for this body — the entry's own Japanese name is shown)
- GB/T naming counterpart (this name is not in the standard)
- 水晶 (GB/T 16552—2017 §5.1.1 c))
- Mineralogical name
- Quartz (SiO2) showing a skeletal / etched growth habit; the name describes crystal habit, not a distinct mineral species
Four-language names
- 简体中文
- 骨干水晶
- 繁體中文
- 骨幹水晶
- English
- Elestial Quartz / Skeletal Quartz
- 日本語
- エレスチャルクォーツ（骸晶状の石英）
See also: Misleading and prohibited trade names · Supplementary name index
Classification
- Origin
- Natural materials
- Material domain
- Natural inorganic gem materials
- Browsing family
- Quartz and chalcedony materials
- Identity tier
- Commercial / trade name
- Mineral chemical class
- Silicates
- Construction or treatment status
- Natural identity; treatment status unknown
Treatments listed by standards
Treatment classes for Elestial Quartz / Skeletal Quartz follow the “Quartz” row of GB/T 16552—2017 Annex B, Table B.1: heating is listed as optimization, irradiation as optimization, filling is defined by grades, dyeing is listed as treatment, and coating as treatment. What Table B.1 notes and how the cited filling grades are defined are explained on this site's Gem treatments page, and the full row including the effect column is on the Quartz entry.
GB/T 16552-2017, Annex B, Table B.1
Under the “Rock Crystal” row of Table B.1: Heating Optimization; Irradiation Optimization; Filling Graded — see §5.4.1, Table 1; Dyeing Treatment; Coating Treatment. The full row, with the effect column, is on the Rock Crystal page.
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 chemical composition, fluorescence, UV-visible spectrum, infrared spectrum and magnification of Elestial Quartz / Skeletal Quartz are given in the cited clause for rock crystal (the whole class). Taking the values for rock crystal (the whole class), Elestial Quartz / Skeletal Quartz is crystalline and trigonal, with hexagonal prismatic crystals bearing distinct horizontal striations on the prism faces; Mohs hardness 7, cleavage none; density 2.64–2.69 g/cm³, derived from the cited clause value 2.66 with tolerance +0.03/-0.02; optic character anisotropic, uniaxial, positive, a bull's-eye interference figure may appear, and Brazil-law twinning is common in amethyst; refractive index 1.544–1.553, birefringence 0.009; when untreated, pleochroism is weak and varies with colour, and lustre is vitreous; chatoyancy may be seen, and asterism may be seen as a six-rayed star, mostly in rose quartz.
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 rock crystal (the whole class), so they are not repeated on the Elestial Quartz / Skeletal Quartz page; see the material facts on the Rock Crystal entry.
Items below that name the class they cover give the cited clause’s value for that whole class, not a measurement of Elestial Quartz / Skeletal Quartz (how to read class-level values).
Structure
Elestial Quartz / Skeletal Quartz — structure (overall): crystalline
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Elestial Quartz / Skeletal Quartz — structure (crystal system): trigonal
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Elestial Quartz / Skeletal Quartz — structure (crystal habit): hexagonal prisms with prominent horizontal striations on the prism faces
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Durability
Elestial Quartz / Skeletal Quartz — Mohs hardness: 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
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Elestial Quartz / Skeletal Quartz — cleavage: none
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Physical properties
Elestial Quartz / Skeletal Quartz — density: 2.64–2.69 g/cm³
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
- Qualification
The clause we cite gives 2.66, with a stated tolerance of +0.03 / -0.02. The range shown here is worked out from that.
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Optical
Elestial Quartz / Skeletal Quartz — optic character: anisotropic material, uniaxial, with positive optic character; a “Bull's eye” interference figure may be present, and Brazil-law twinning is common in amethyst.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Elestial Quartz / Skeletal Quartz — refractive index: 1.544–1.553
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Elestial Quartz / Skeletal Quartz — birefringence: 0.009
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Elestial Quartz / Skeletal Quartz — pleochroism: weak; it depends on the body colour.
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Elestial Quartz / Skeletal Quartz — optical effect (chatoyancy): seen
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Elestial Quartz / Skeletal Quartz — optical effect (asterism): seen; a six-rayed star, common in rose quartz.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
- CIBJO definitions
- chatoyancy, asterism
Quality factors
Elestial Quartz / Skeletal Quartz — quality factor (lustre): vitreous
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (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
Evidence and sources
Authority basis and clause sources
Sources
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.
Related-entry tree for Quartz on this site: 74 entries listed by this site's parent-entry links; synthetic, treated and similar entries carry their recorded state after the name; this page (Elestial Quartz / Skeletal Quartz) is marked.
- Quartz
Sub-entries (57)
- Agate
Sub-entries (1)
- Amethyst
- Ametrine
- Aventurine Quartz
- Aventurine Quartz / Green Aventurine
- Banded Agate
- Black Agate
- Bloodstone / Heliotrope
- Blue Lace Agate
- Carnelian
- Chalcedony
Sub-entries (2)
- Chrysoprase
- Citrine
- Clear Quartz / Rock Crystal
- Coated Quartz
- Colourless to White Quartz (brand name: Azeztulite)
- Crazy Lace Agate
- Dendritic Agate
- Dyed Agate (Treated: dyed)
- Elestial Quartz / Skeletal Quartz
- Eye Agate
- Flower Agate / Cherry Blossom Agate
- Green Quartz
- High-clarity quartz with golden needle-like inclusions
- Included Quartz
- Jasper
Sub-entries (1)
- Madeira Citrine
- Malachite Agate
- Morion / very dark Smoky Quartz
- Moss Agate
- Moss Chalcedony
- Multi-inclusion Quartz
- Onyx (banded chalcedony)
- Phantom Quartz
- Prase
- Prasiolite / Green Quartz
- Quartz Cat’s-eye
- Quartz claimed to be from the Himalayas
- Quartz Crystal
- Quartz with dark needle-like inclusions
- Quartz with fine fibrous inclusions
- Quartz with flower-like inclusions
- Quartz with golden needle-like inclusions
- Quartz with green needle-like inclusions
- Quartzite Jade
- Quartzose Jade
- Red Agate
- Rock Crystal
- Rose Quartz
- Rutilated Quartz
- Sard
- Sardonyx
- Silicified Asbestos
Sub-entries (2)
- Hawk’s Eye
- Tiger’s Eye
Sub-entries (1)
- Smoky Quartz
- Smoky Quartz (brown variety)
- Strawberry Quartz
- Yellow-green Quartz
- Agate
This table scrolls sideways on narrow screens.
| Page | Content | Status |
|---|---|---|
| Browsing family | Quartz and chalcedony materials | Live |
| Treatments recorded for this material | Heated / Heat-treated (via parent material), Irradiated (via parent material), Filled / Fracture-filled (via parent material), Dyed (via parent material), Coated (via parent material) | Live |
| Related articles | To be added (placeholder) | Planned |
Who maintains this page
The material facts in the Elestial Quartz / Skeletal Quartz 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. The entry exists so that buyers and sellers can check naming, disclosure and material facts item by item.