On this page
UnderstandWhat it is, what people ask, how far this page goes
Natural inorganic gem materials · Trade name: colour / appearance variety · Natural identity; treatment status unknown
Spectrolite
A trade name for Labradorite with intense colour play, mostly associated with material from Finland. It is not a separate mineral species, and an origin should not be assumed from the 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 Spectrolite forms and what gives its colourFormation setting, process and timescale; where its colour and optical effects come from, each finding graded and sourced
- How to identify SpectroliteHow far lab testing can go
- Treatments and enhancements of Spectrolite1 registered treatments: status, stability, how common they are and identification leads
- Caring for and wearing SpectroliteCleaning, heat, chemicals and light, as the cited sources give them
- Hardness, density and refractive index of SpectroliteEach value with its source and check date
- Spectrolite in English, Chinese and Japanese; national standard namesNames in four languages, the GB/T standard name and the suggested listing name; and: Which of GIA, FTC, CIBJO and Gem-A have a name for it on record, and do those agree?
- Listing and disclosing SpectroliteThe 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
‘Spectrolite’ is a trade name for the strongly iridescent, nearly black labradorite from Finland — a calcic plagioclase variety, not a separate mineral species. Its formation is the same as other iridescent labradorite: in plutonic rocks, extremely slow cooling exsolves the plagioclase solid solution into periodically alternating calcic and sodic nanometer-scale lamellae (the Bøggild intergrowth), and white light undergoes thin-film and multilayer interference at these interfaces, producing structural iridescence. The dark bodycolour, set by iron oxide inclusion density, limits how deep light travels, so spectrolite’s iridescence is concentrated at the crystal’s surface as a surface ‘coating’ effect, whereas inclusion-poor light labradorite shows iridescence from deeper inside.
Scope: Covers the natural material identity and optical-effect mechanism of the near-black, highly iridescent labradorite from Finland (trade name spectrolite); does not cover labradorite varieties from other localities.
Sources G&G Summer 2025
Where it forms
The general occurrence of iridescent labradorite (spectrolite included) is in plutonic rocks cooled extremely slowly or subjected to high-grade metamorphism.
Sources G&G Summer 2025
Finland is one of the best-known sources of fine iridescent labradorite, yielding nearly black, surface-iridescent spectrolite.
Sources G&G Summer 2025
How it forms, step by step
A plagioclase solid solution crystallizes in a plutonic rock, with calcic and sodic components coexisting homogeneously.
Extremely slow cooling exsolves the solid solution into periodically alternating calcic/sodic nanometer-scale lamellae (the Bøggild intergrowth).
White light undergoes thin-film and multilayer interference at the lamellar interfaces, producing orientation-dependent iridescence (labradorescence).
A high density of iron oxide inclusions makes the body nearly black, so light cannot penetrate deeply and the iridescence is concentrated near the surface.
Link to appearance
The nearly black body and surface-hugging iridescence are spectrolite’s hallmark: the darker the body, the more the iridescence is confined to the surface, while lighter, inclusion-poor material glows from deeper inside.
Sources G&G Summer 2025
Timescale
The sources give no absolute age or duration for spectrolite (labradorite) exsolution, describing only the condition of extremely slow cooling.
Sources G&G Summer 2025
Related base materials
- Labradorite (plagioclase feldspar): Spectrolite is a commercial name for near-black labradorite with strong iridescence
Recorded localities
Authoritative sources name a single or principal locality.
Europe
- Ylämaa, near Lappeenranta, FinlandGIA describes spectrolite as the trade name for labradorite from a small area of southeastern Finland; the G&G 1990s table lists Ylämaa under Finnish feldspar
Sources GIA News (2017) · G&G Summer 2025 · Gems & Gemology Winter 2000
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 how far testing can go on this page, the origin determination guide and the overview of recorded localities.
Causes of colour and optical effects
Like labradorite, spectrolite’s iridescence is a structural colour produced by thin-film and multilayer interference at exsolved calcic/sodic nanometer lamellae (the Bøggild intergrowth).
Evidence grade AScope: Applies to iridescent labradorite with exsolution textures; material lacking them shows none.
The nearly black spectrolite, where light cannot penetrate deeply, shows iridescence at the crystal’s surface, whereas inclusion-poor light labradorite (such as material traded as ‘rainbow moonstone’) shows iridescence from deeper inside the crystal.
Evidence grade AScope: Relates bodycolour (iron oxide inclusion density) to iridescence depth; it can vary within one crystal.
Other research findings
Spectrolite is a trade name for strongly iridescent, nearly black labradorite from Finland — a feldspar (plagioclase) material, not a separate mineral species.
Evidence grade AScope: A locality-and-bodycolour trade name; mineralogically it remains labradorite.
Iridescent feldspars are separated into labradorite, peristerite and moonstone categories by bulk composition; spectrolite falls within the labradorite category.
Evidence grade AScope: Classification follows An–Ab–Or composition; trade names do not map one-to-one onto it.
Limits of this research
- Research status: Only partial material-specific findings found; gaps are stated as gaps
- The authority text describes spectrolite only in one qualitative sentence (nearly black bodycolour, surface iridescence); no deposit, mining history or dating data are given.
- No absolute age or duration of labradorite exsolution is provided.
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
- High-iridescence Labradorite
GB/T 16552—2017 5.1.1 c) · CIBJO Gemmological Laboratories Book 2024 §7.2.1.222 “Spectrolite”
Construction or treatment status
Natural identity; treatment status unknown
Treatments recorded for this material: Filled / Fracture-filled (via parent material), Coated (via parent material), Diffusion-treated (via parent material), Irradiated (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
"Spectrolite" 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 "High-iridescence Labradorite" 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
- High-iridescence Labradorite
Care and wear
Normal care for every gemstone (CIBJO Gemstone Book §6.1), in brief:
- Handle it gently.
- Store pieces apart when not worn, so they cannot scratch each other.
- Clean with warm soapy water and a soft brush.
- Use ultrasonic cleaners only with caution.
The §6.1 wording and the full list of §6.2 special-care letters cited on this page are on the general gem care page.
Care
Spectrolite — care (cleaning): Some stones are susceptible to damage from ultrasonic cleaning. Do not expose them to ultrasonic cleaning.
CIBJO Gemstone Book 2022
CIBJO Gemstone Book §6.2:special-care code j
- Treatment state
- any treatment state
Source & check 2026-09-25
- Source
- CIBJO Blue Book — Official Gemstone Book (Coloured Stone Commission 2022) (CIBJO): §8 Annex C, Spectrolite, p.52-53; §6.2 j (locator checked 2026-09-25)
- Fact checked on
- 2026-09-25
Spectrolite — care (chemicals): Treatments with dye, oil, resin, wax or plastic are not permanent; keep it away from all solvents (including dish-washing liquids), chemicals and heat.
CIBJO Gemstone Book 2022
CIBJO Gemstone Book §6.2:special-care code k
- Treatment state
- treated
Source & check 2026-09-25
- Source
- CIBJO Blue Book — Official Gemstone Book (Coloured Stone Commission 2022) (CIBJO): §8 Annex C, Spectrolite, p.52-53; §6.2 k (locator checked 2026-09-25)
- Fact checked on
- 2026-09-25
Spectrolite — care (wear): cleaves or fractures easily or is brittle (e.g. rubbed facet edges); wear with care.
CIBJO Gemstone Book 2022
CIBJO Gemstone Book §6.2:special-care code b
- Treatment state
- any treatment state
Source & check 2026-09-25
- Source
- CIBJO Blue Book — Official Gemstone Book (Coloured Stone Commission 2022) (CIBJO): §8 Annex C, Spectrolite, p.52-53; §6.2 b (locator checked 2026-09-25)
- Fact checked on
- 2026-09-25
Spectrolite — care (wear): Some stones are prone to scratching due to low hardness. Wear them with care.
CIBJO Gemstone Book 2022
CIBJO Gemstone Book §6.2:special-care code a
- Treatment state
- treated
- Only after these treatments
- dyeing
Source & check 2026-09-25
- Source
- CIBJO Blue Book — Official Gemstone Book (Coloured Stone Commission 2022) (CIBJO): §8 Annex C, Spectrolite, p.52-53; §6.2 a (locator checked 2026-09-25)
- Fact checked on
- 2026-09-25
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
CleaningIn the care entries of the CIBJO Blue Book — Official Gemstone Book (Coloured Stone Commission 2022), the ultrasonic cleaning item for Spectrolite states that it should not be cleaned ultrasonically, regardless of treatment status. ChemicalsThe chemical care registered by CIBJO states that for treated Spectrolite, dyeing, oiling, resin impregnation, waxing or plastic impregnation are all non-permanent, so it must be kept away from all solvents (including all detergents), chemicals and heat. WearThe wear care registered by CIBJO states that Spectrolite, regardless of treatment status, is prone to breaking, so wear it with care; treated Spectrolite, in the case of dyeing only, is soft and scratches easily, so wear it with care.
This table scrolls sideways on narrow screens.
| Question | Matching entries |
|---|---|
| Can it go in an ultrasonic or steam cleaner? | care (cleaning) |
| Contact with acids, alkalis and household chemicals | Treatments with dye, oil, resin, wax or plastic are not permanent; keep it away from all solvents (including dish-washing liquids), chemicals and heat |
| Wearing limits (knocks, settings) | cleaves or fractures easily or is brittle (e.g. rubbed facet edges); wear with care; care (wear) |
Care entries by treatment state
The same entries grouped by the treatment state each applies to; each links to its full wording and source. Letters are CIBJO special-care codes, explained on the gemstone care page.
any treatment state
- care (cleaning) §6.2 j
- cleaves or fractures easily or is brittle (e.g. rubbed facet edges); wear with care §6.2 b
treated
treated (Only after these treatments: dyeing)
- care (wear) §6.2 a
Treatments and identification leads
Registered treatmentsThe registered treatment for Spectrolite is surface waxing, with the status treated, stability unstable and prevalence occasional. Values not givenThe identification leads and source for surface waxing are both marked “—”, meaning the cited source gives no value, not “none”. Identification cluesThe registered identification leads for each treatment can be used when sending a stone for testing and agreeing on the tests to be done.
This table scrolls sideways on narrow screens.
| Treatment | Market frequency (CIBJO) | Stability (CIBJO) | GB/T 16552 category | JJA/AGL listing | Identification leads |
|---|---|---|---|---|---|
| surface waxingStatus: treated | occasionally | unstable | — | — | — |
| Filling | — | — | Graded — see §5.4.1, Table 1 | — | — |
| Coating | — | — | Treatment | — | — |
| Diffusion | — | — | Treatment | — | — |
| Irradiation | — | — | Treatment | — | — |
Where each treatment acts (schematics): Waxed
“—” means the cited source gives no value for that item, not “none”. Source: CIBJO Gemstone Book 2022; GB/T 16552—2017 Table B.1 (row for Feldspar)
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
What this table covers
What this page can give
- Registered treatments, their stability and how often they occur (see the table above)
- Identification leads for each treatment, for use when sending a stone for testing
VerifyNames, standards, technical facts, clauses and sources
Names
Besides Spectrolite, the name register records "Spectrolite", for which no restriction on use as a name is recorded.
Trade and mineralogical namesSpectrolite is a trade name and a market name, not a mineral species name; GB/T 16552—2017 does not contain the name, its GB/T naming counterpart is Labradorite in Table A.1. Recommended listing nameThe suggested listing name is high-colour Labradorite. Names in four languagesThe four-language names are the Simplified and Traditional Chinese names, English Spectrolite and the Japanese name; the Japanese name is the entry's own, and GSJ's wording for it is not yet verified by this site. Institution usageFor authority wording, this site records only CIBJO's wording, the CIBJO Gemmological Laboratories Book 2024 recording Spectrolite; the FTC text on file has no wording for Spectrolite (checked); GIA and Gem-A are unchecked, and bodies without a recorded wording show the entry's own English name, which does not represent their position. Trade and mineralogical namesSpectrolite is a trade name for high-colour labradorite, particularly associated with Finland.
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) | ||||
| SpectroliteEnglish | market name | matched automatically | no restriction recorded | editorial ruling (no clause cited) |
How each authority words this name: see Names › Authority wording.
- GSJ (Japan) formal name
- スペクトロライト (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)
- 拉长石 (GB/T 16552—2017 Table A.1)
- Mineralogical name
- Trade name for high-color labradorite, especially Finland
Four-language names
- 简体中文
- 光谱石
- 繁體中文
- 光譜石
- English
- Spectrolite
- 日本語
- スペクトロライト
See also: Misleading and prohibited trade names · Supplementary name index
Classification
- Origin
- Natural materials
- Material domain
- Natural inorganic gem materials
- Browsing family
- Feldspar materials
- Identity tier
- Trade name: colour / appearance variety
- Mineral chemical class
- Silicates
- Construction or treatment status
- Natural identity; treatment status unknown
Treatments listed by standards
For the treatments listed by standards, Spectrolite follows GB/T 16552—2017 Annex B, Table B.1: this site applies the entry for Feldspar in Table B.1, which lists filling, coating, diffusion and irradiation; filling is graded, with each grade defined on this site's Gem treatments page, while coating, diffusion and irradiation are all listed as treatments. What Table B.1 is can be found on this site's Gem treatments page, and the full row including the effect of each treatment is on the Feldspar entry.
GB/T 16552-2017, Annex B, Table B.1
Under the “Feldspar” row of Table B.1: Filling Graded — see §5.4.1, Table 1; Coating Treatment; Diffusion Treatment; Irradiation Treatment. The full row, with the effect column, is on the Feldspar 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
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 feldspar (the whole mineral group), so they are not repeated on the Spectrolite page; see the material facts on the Feldspar entry.
Items below that name the class they cover give the cited clause’s value for that whole class, not a measurement of Spectrolite (how to read class-level values).
Structure
Spectrolite — structure (overall): crystalline
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Spectrolite — structure (crystal system): Moonstone and amazonite belong to the monoclinic or triclinic system; sunstone and labradorite are triclinic.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Spectrolite — structure (crystal habit): Crystals are tabular or stubby prisms; Carlsbad, polysynthetic and gridiron (cross-hatched) twinning are common.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Durability
Spectrolite — Mohs hardness: 6–6.5
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
- feldspar (the whole mineral group)
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Spectrolite — cleavage: two directions of perfect cleavage
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
For Spectrolite, the stability of surface waxing is “unstable”.
CIBJO Gemstone Book 2022
- Treatment state
- treated
- Treatment
- surface waxing
- Qualification
This says how well the treatment holds up, not how durable Spectrolite itself is.
- General note
- no durability verdict here
Source & check 2026-09-25
- Source
- Fact checked on
- 2026-09-25
Physical properties
Spectrolite — density: 2.55–2.75 g/cm³
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
- General note
- the clause has finer ranges
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Optical
Spectrolite — optic character: biaxial and anisotropic; optic sign may be either positive or negative.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Spectrolite — refractive index: 1.508–1.572
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
- General note
- the clause has finer ranges
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Spectrolite — birefringence: 0.005–0.01
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
- General note
- the clause has finer ranges
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Spectrolite — transparency: translucent to opaque.
CIBJO Gemmological Laboratories Book 2024
Source & check 2026-09-22
- Source
- Fact checked on
- 2026-09-22
Spectrolite — pleochroism: usually absent
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Spectrolite — optical effect (iridescence): seen
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Spectrolite — optical effect (chatoyancy): seen
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Spectrolite — optical effect (asterism): seen
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Spectrolite — optical effect (aventurescence): seen
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Spectrolite — optical effect (labradorescence): labradorescence.
CIBJO Gemmological Laboratories Book 2024
Source & check 2026-09-22
- Source
- Fact checked on
- 2026-09-22
Spectrolite — body colour: grey to nearly black.
CIBJO Gemmological Laboratories Book 2024
- Treatment state
- untreated
- Qualification
In chapter 7 of the CIBJO Gemmological Laboratories Book, the colour descriptions of Hematite, Carbonado, Howlite and other entries also name grey or a greyish colour.
- General note
- colour alone is not identity
Source & check 2026-09-22
- Source
- Fact checked on
- 2026-09-22
- CIBJO definitions
- chatoyancy, asterism, aventurescence, labradorescence
Quality factors
Spectrolite — quality factor (lustre): vitreous
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- What this covers
- feldspar (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.17 (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): 1.54 / 2.65; Closest values: 1Charoite 1.554 / 2.66, 2Changhua Stone 1.56 / 2.6, 3Shoushan Stone 1.56 / 2.7, 4Balin Stone 1.56 / 2.55, 5Bamboo Coral 1.57 / 2.65
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
Testing and market
Under CIBJO's laboratory rules, Spectrolite is identified under the feldspar entry; the procedure is in the identification part of the feldspar entry, and the list of required methods is on the laboratory testing page. Among spectrolite in circulation, surface waxing is occasional, with the status treated.
The CIBJO laboratory protocol covers Spectrolite under “Feldspar” (§6.1.34): see identification on the Feldspar entry; the required tests are listed on the CIBJO laboratory protocol table for Feldspar.
How far testing can go
For Spectrolite in trade, the reported frequency of surface waxing is “occasionally”.
CIBJO Gemstone Book 2022
- Treatment state
- treated
- Treatment
- surface waxing
Source & check 2026-09-25
- Source
- Fact checked on
- 2026-09-25
Each row's “Source & check” expands to the full source; the date beside it is the fact check date.
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 Feldspar on this site: 13 entries listed by this site's parent-entry links; synthetic, treated and similar entries carry their recorded state after the name; this page (Spectrolite) is marked.
This table scrolls sideways on narrow screens.
| Page | Content | Status |
|---|---|---|
| Browsing family | Feldspar materials | Live |
| Treatments recorded for this material | Filled / Fracture-filled (via parent material), Coated (via parent material), Diffusion-treated (via parent material), Irradiated (via parent material) | Live |
| Related articles | To be added (placeholder) | Planned |
Who maintains this page
The material facts in the Spectrolite 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.