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UnderstandWhat it is, what people ask, how far this page goes
Natural inorganic gem materials · Mineral species · Natural identity; treatment status unknown
Amblygonite
Also known asMontebrasite (conditional name)
A lithium aluminium phosphate mineral species listed in GB/T 16552—2017 Table A.1; it must be distinguished from Montebrasite and other minerals of the same series. 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 Amblygonite forms and what gives its colourFormation setting, process and timescale, each finding graded and sourced
- How to identify AmblygoniteHow far lab testing can go and whether a synthetic exists
- Caring for and wearing AmblygoniteCleaning, heat, chemicals and light, as the cited sources give them; durability indicators and wearing advice
- Hardness, density and refractive index of AmblygoniteEach value with its source and check date
- Amblygonite 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?
- Name origin and history of AmblygoniteWhere the name comes from
- Listing and disclosing AmblygoniteThe listing name to use; what must be disclosed before sale
- Standard clauses that define AmblygoniteWhich 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
Amblygonite is a lithium-bearing aluminium phosphate, LiAl(PO4)(F,OH), triclinic. Its F to OH ratio is variable and it forms an amblygonite-montebrasite solid-solution series, so 'amblygonite' is a compositionally variable series rather than a fixed composition. According to the data sheet it is an uncommon accessory mineral in zoned granite pegmatites and also occurs in high-temperature tin veins and greisens, associated with lacroixite, apatite, lithiophilite, spodumene, lepidolite, petalite, pollucite, and tourmaline in pegmatites and with cassiterite, topaz, and mica in greisens. Its formation is tied to lithium-, phosphorus-, and fluorine-rich pegmatitic or high-temperature hydrothermal fluids.
Scope: Applies to the composition and occurrence of amblygonite as a mineral of a variable solid-solution series; does not include geochronology of specific pegmatites, and compositional proportions require measurement.
Sources Handbook of Mineralogy
Where it forms
An accessory phase in zoned granite pegmatites
Sources Handbook of Mineralogy
Tin-bearing veins and greisens of high temperature
Sources Handbook of Mineralogy
How it forms, step by step
Lithium-, phosphorus-, and fluorine-bearing pegmatitic melts or high-temperature fluids are enriched.
Sources Handbook of Mineralogy
The fluids crystallize or metasomatize the host within zoned pegmatites or high-temperature tin veins and greisens.
Sources Handbook of Mineralogy
Lithium, aluminium, phosphate, and fluorine/hydroxyl combine to precipitate triclinic amblygonite.
Sources Handbook of Mineralogy
As the F:OH ratio varies, the solid solution ranges across the amblygonite-montebrasite series and intergrows with spodumene and lepidolite.
Sources Handbook of Mineralogy
Link to appearance
Amblygonite is milk-white, pale yellow, beige, salmon-pink, pale green, pale blue, or gray, and may be colorless; it is transparent to translucent with vitreous to greasy luster and pearly on good cleavages.
Sources Handbook of Mineralogy
Timescale
The source does not state an absolute geological timescale for amblygonite formation.
Sources Handbook of Mineralogy · CIBJO Gemstone Book 2022
Supporting findings
Amblygonite is an uncommon accessory mineral in zoned granite pegmatites and also occurs in high-temperature tin veins and greisens.
Evidence grade BScope: A general occurrence summary, not a deposit model.
Sources Handbook of Mineralogy
Recorded localities
Authoritative sources list the localities below; the list is not exhaustive.
Africa
- Near Karibib, Erongo, Namibia
Sources Handbook of Mineralogy
Asia
- Kalatan pegmatite field, Nuristan, Afghanistan
Sources Mindat: Amblygonite Group
North America
- Black Hills, South Dakota, United States
Sources Mindat: Amblygonite Group
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.
Where the name comes from
Amblygonite's English name is built from Greek words for 'blunt' and 'angle', a nod to its cleavage angle of roughly 90°.
Evidence grade BScope: Etymology explains the origin of the name only; it does not establish the material's composition, locality, naturalness, or treatment.
Sources Handbook of Mineralogy
Other research findings
Amblygonite is a lithium-bearing aluminium phosphate, LiAl(PO4)(F,OH), triclinic.
Evidence grade BScope: Ideal composition; the F:OH ratio is variable.
Sources Handbook of Mineralogy
Amblygonite forms a solid-solution series with montebrasite, its composition varying continuously between F and OH.
Evidence grade BScope: The series relationship and compositional variability, not any single sample's ratio.
Sources Handbook of Mineralogy
The name amblygonite is from the Greek for blunt and angle, referring to its ~90 degree cleavage angle.
Evidence grade BScope: Etymology only.
Sources Handbook of Mineralogy
In the CIBJO standard, Amblygonite is listed as a mineral species and the Montebrasite entry cross-references 'See Amblygonite', indicating they are treated as a series.
Evidence grade AScope: Confirms nomenclature and series cross-reference only.
Sources CIBJO Gemstone Book 2022
Limits of this research
- Research status: Formation, occurrence or other material-specific findings found in authoritative sources
- Amblygonite's composition varies continuously across the amblygonite-montebrasite series, so a sample's F:OH ratio must be measured.
- The data sheet gives no absolute ages or specific P-T conditions for amblygonite formation.
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
- Amblygonite
GB/T 16552—2017 Table A.1 “Amblygonite” · IMA Mineral List 2026-07 “Amblygonite”
Construction or treatment status
Natural identity; treatment status unknown
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
Amblygonite is Amblygonite; use "Amblygonite" for listings, and disclose any known treatments.
Evidence
- GB/T · Table A.1, row 磷铝锂石 (Amblygonite)
What this means for you
Before buying, check the recommended listing name "Amblygonite" and any disclosed treatments on this page, and ask the seller for a grading report if in doubt.
Known uncertainty
- Last reviewed
- 2026-09-01
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
Amblygonite — 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, Amblygonite, p.33; §6.2 j (locator checked 2026-09-25)
- Fact checked on
- 2026-09-25
Amblygonite — care (heat): Some stones are prone to damage due to thermal shock. Do not expose them to extreme temperature changes.
CIBJO Gemstone Book 2022
CIBJO Gemstone Book §6.2:special-care code e
- 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, Amblygonite, p.33; §6.2 e (locator checked 2026-09-25)
- Fact checked on
- 2026-09-25
Amblygonite — care (special care): untreated: avoid heat.
AGTA Gemstone Information Manual, 17th ed.
- Treatment state
- untreated
Source & check 2026-09-26
- Source
- AGTA Gemstone Information Manual, 17th edition (August 2026) (AGTA): p.VII, Gemstone Information Chart, Amblygonite (Montebrasite) N, CARE REQUIRED / SPECIAL ADVICE (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Amblygonite — care (special care): irradiated for colour: special care (SC); the colour fades, so avoid heat and chemicals.
AGTA Gemstone Information Manual, 17th ed.
- Treatment state
- treated
- Only after these treatments
- irradiation
Source & check 2026-09-26
- Source
- AGTA Gemstone Information Manual, 17th edition (August 2026) (AGTA): p.VII, Gemstone Information Chart, Amblygonite R, CARE REQUIRED / SPECIAL ADVICE (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.
Common care questions and matching entries
CleaningCare for Amblygonite: the CIBJO Blue Book — Official Gemstone Book states that, in any treatment state, Amblygonite must not be cleaned ultrasonically and is sensitive to sudden temperature changes. AGTAThe American Gem Trade Association (AGTA) Gemstone Information Manual, 17th edition, gives advice by treatment state: untreated Amblygonite should be kept away from high heat; Amblygonite irradiated to improve its colour (irradiation only) needs special care (marked SC), as the colour can fade, and should be kept away from high heat and chemicals.
This table scrolls sideways on narrow screens.
| Question | Matching entries |
|---|---|
| Can it go in an ultrasonic or steam cleaner? | care (cleaning) |
| Heat and thermal shock | care (heat) |
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
- care (heat) §6.2 e
untreated
treated (Only after these treatments: irradiation)
Durability and wearing
Toughness
Brittle
Fracture
Uneven to subconchoidal
Sources Handbook of Mineralogy
VerifyNames, standards, technical facts, clauses and sources
Names
Besides Amblygonite, the name register records "Montebrasite", for which no restriction on use as a name is recorded (CIBJO Gemmological Laboratories Book 2024 §7.2.1.149 “Montebrasite”).
Standard and listing namesThe Chinese standard name for Amblygonite comes from GB/T 16552—2017 Table A.1, and the suggested listing name is also Amblygonite; the mineralogical name is Amblygonite. Names in four languagesNames are registered in four languages: Simplified Chinese, Traditional Chinese, English (Amblygonite) and Japanese. Institution usageOn authority wording, CIBJO records Amblygonite (CIBJO Gemmological Laboratories Book 2024); the FTC text on file has no wording for this name (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. Japanese namesFor the GSJ (Japan), the Japanese name shown is the entry's own, and the wording used by the GSJ for this name is not yet verified by this site. Candidate search termsThe English synonym Montebrasite is used only as a candidate search term for Amblygonite.
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) | ||||
| MontebrasiteEnglish | synonym | search candidate only | no restriction recorded | CIBJO Gemmological Laboratories Book 2024 §7.2.1.149 “Montebrasite” |
How each authority words this name: see Names › Authority wording.
- GSJ (Japan) formal name
- アンブリゴナイト (not yet checked for this body — the entry's own Japanese name is shown)
- Chinese formal name
- 磷铝锂石 (GB/T 16552—2017 Table A.1)
- Mineralogical name
- Amblygonite
- Trade names and synonyms
- Montebrasite (synonym; conditional name)
Four-language names
- 简体中文
- 磷铝锂石
- 繁體中文
- 磷鋁鋰石
- English
- Amblygonite
- 日本語
- アンブリゴナイト
See also: Misleading and prohibited trade names · Supplementary name index
Classification
- Origin
- Natural materials
- Material domain
- Natural inorganic gem materials
- Browsing family
- Phosphate minerals
- Identity tier
- Mineral species
- Mineral chemical class
- Phosphates
- Construction or treatment status
- Natural identity; treatment status unknown
What it is and how it's identified
Registered material facts for Amblygonite include: chemical composition (Li,Na)Al(PO4)(F,OH), phase amblygonite; crystalline, triclinic, with a short prismatic habit, commonly polysynthetic twinning, and often compact massive aggregates. Mohs hardness is 5–6; site note: hardness alone is not enough to judge durability. Single crystals have perfect cleavage in two directions; aggregates generally show no cleavage. Density is 2.98–3.06 g/cm³, worked out from the cited clause's 3.02 and its stated tolerance of ±0.04. Optic character is anisotropic, biaxial, optically positive or negative; refractive index is 1.578–1.636, worked out from the cited clause's 1.612–1.636 and its stated tolerance of −0.034; birefringence is 0.02–0.027 (site note: the overall value is used, as the clause also gives finer sub-ranges). Transparency is transparent, and untreated Amblygonite has a vitreous lustre; the UV-visible spectrum is not diagnostic, and the mid-infrared region shows the characteristic infrared absorption bands of amblygonite.
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”.
Definition
Amblygonite — nomenclature status: IMA status G: grandfathered (described before the IMA existed, and generally regarded as a valid species).
CIBJO Gemmological Laboratories Book 2024
Source & check 2026-09-22
- Source
- Fact checked on
- 2026-09-22
Amblygonite — composition (chemistry): (Li,Na) Al (PO4) (F,OH)
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Amblygonite — composition (phase): amblygonite
CIBJO Gemmological Laboratories Book 2024
Source & check 2026-09-22
- Source
- Fact checked on
- 2026-09-22
Structure
Amblygonite — structure (overall): crystalline
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Amblygonite — structure (crystal system): triclinic
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Amblygonite — structure (crystal habit): stubby prisms, frequently polysynthetically twinned; most material occurs as compact massive aggregates.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Durability
Amblygonite — Mohs hardness: 5–6
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
- General note
- hardness only, not durability
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Amblygonite — cleavage: Single crystals cleave perfectly in two directions; aggregates usually show no cleavage.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Physical properties
Amblygonite — density: 2.98–3.06 g/cm³
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- Qualification
The clause we cite gives 3.02, with a stated tolerance of ±0.04. The range shown here is worked out from that.
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Optical
Amblygonite — optic character: biaxial and anisotropic, with a positive or a negative optic sign.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Amblygonite — refractive index: 1.578–1.636
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- Qualification
The clause we cite gives 1.612–1.636, with a stated tolerance of -0.034. The range shown here is worked out from that.
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Amblygonite — birefringence: 0.02–0.027
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- General note
- the clause has finer ranges
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Amblygonite — transparency: transparent.
CIBJO Gemmological Laboratories Book 2024
Source & check 2026-09-22
- Source
- Fact checked on
- 2026-09-22
Amblygonite — pleochroism: none to weak, depending on colour; cannot be measured on aggregates.
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Amblygonite — fluorescence (overall): long wave very weak, green; long and short wave phosphorescent.
GB/T 16553—2017
UV fluorescencegreenvery weakDots are illustrative colours built from the colour names, not measured values
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Amblygonite — spectrum (UV-visible): non-characteristic
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Amblygonite — spectrum (infrared): diagnostic bands of amblygonite in the mid-IR
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Amblygonite — magnification: gas-liquid inclusions, mineral inclusions, growth striations, visible doubling of facet edges (birefringence), cloudy bands running parallel to the cleavage, aggregates of granular structure or compact massive structure.
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
body colour2 sources compared
Amblygonite — body colour: Colourless to light yellow to greenish yellow, transparent; may be light pink, green, blue or brown.
CIBJO Gemmological Laboratories Book 2024
- Treatment state
- untreated
- Qualification
In chapter 7 of the CIBJO Gemmological Laboratories Book, the colour descriptions of Phenakite, Smithsonite, Kornerupine and other entries also name colourless.
- General note
- colour alone is not identity
Source & check 2026-09-22
- Source
- Fact checked on
- 2026-09-22
Amblygonite — body colour: colourless to pale yellow, green-yellow, light pink, green, blue, brown and more.
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 Topaz, Fluorite, Kornerupine and other variety clauses also name colourless.
- General note
- colour alone is not identity
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
How the sources relate
- CIBJO Gemmological Laboratories Book 2024 and GB/T 16553—2017
The two entries agree: colourless to light yellow and greenish yellow, as well as light pink, green, blue and brown.
Quality factors
Amblygonite — quality factor (lustre): vitreous
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.40 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Each row's “Source & check” expands to the full source; the date beside it is the fact check date.
This material (RI / SG midpoints): 1.607 / 3.02; Closest values: 1Brazilianite 1.611 / 2.97, 2Bi Yu, Green Nephrite Variety 1.621 / 3, 3Dolomite 1.624 / 3.03, 4Chlorite 1.629 / 3, 5Lazulite 1.627 / 3.12
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
The tests the CIBJO laboratory protocol requires for this material, and what each method means, are in the protocol table on the laboratory testing page: §6.1.3.
How far testing can go
Amblygonite — synthetic counterpart on the market: No synthetic counterpart of this material is commercially available
CIBJO Gemstone Book 2022
- Treatment state
- any treatment state
Source & check 2026-09-22
- Source
- Fact checked on
- 2026-09-22
Each row's “Source & check” expands to the full source; the date beside it is the fact check date.
Clause-level definitions
Amblygonite has a direct definition in the CIBJO Gemmological Laboratories Book 2024 under the term Amblygonite: mineral species amblygonite, IMA status G (grandfathered), with the CIBJO wording quoted in full under Clause-level definitions on this page; the cross-check result is that CIBJO defines it directly and it also appears in the GB/T annex. The CIBJO Gemmological Laboratories Book 2024 also carries a Montebrasite entry, described as colourless, white, yellow, light green, light blue or pink, transparent; the cross-check result is a direct CIBJO definition, with no identically named English entry found in the GB/T annex. The IMA Mineral List entry registers Amblygonite with LiAl(PO4)F and IMA status G, cross-checked against the RRUFF/IMA master mineral list (public domain data).
This table scrolls sideways on narrow screens.
| Term | Clause | Definition | Cross-check |
|---|---|---|---|
| Amblygonite | 7.2.1.9 | Colourless to light yellow to greenish yellow, transparent; may be light pink, green, blue or brown | Defined directly by CIBJO; also present in the GB/T annex. |
| Montebrasite | 7.2.1.149 | colourless, white, yellowish, light green, light blue, pink; transparent | Defined directly by CIBJO; no identically named English entry was found in this edition of the GB/T annex. |
| Amblygonite | IMA Mineral List entry | Amblygonite LiAl(PO4)F G 1818 | Cross-checked against the RRUFF/IMA master mineral list (public domain data). |
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.
- RRUFF Project, in partnership with the IMA – International Mineralogical Association. IMA Mineral List.
- Geological Survey of Japan, AIST (Japan). Museum mineral specimens, browse by classification.
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 | Phosphate minerals | Live |
| Related articles | To be added (placeholder) | Planned |
Who maintains this page
The material facts in the Amblygonite 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.