How can you identify Cryolite?

Compare several properties rather than relying on colour alone. This entry records colour: Colorless to white, brownish; lustre: Vitreous to greasy; streak: White; Mohs hardness: 2.5; cleavage: Poor; crystal system: Monoclinic; transparency: Transparent to translucent. Confirm an important identification with additional field tests or qualified laboratory work.

What is Cryolite commonly confused with?

Cryolite may be confused with Calcite, Quartz, Feldspar. Compare multiple diagnostic properties because colour and surface appearance can overlap.

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Cryolite identification and geology

Sodium aluminum fluoride once essential for aluminum smelting. Nearly invisible in water due to similar refractive index. Color: Colorless to white, brownish. Luster: Vitreous to greasy. Streak: White. Cleavage: Poor. Hardness: 2.5. Transparency: Transparent to translucent. Crystal system: Monoclinic. Chemical formula: Na₃AlF₆. Specific gravity: 2.97. Formation: Forms in rare alkaline granitic pegmatites. The only major deposit was at Ivigtut, Greenland now exhausted . Common geological settings: Greenland Ivigtut, historic , Spain, USA; extremely rare in nature. Common look-alikes and related entries: Calcite, Quartz, Feldspar.

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Calcite
Quartz
Feldspar

Sources, scope & corrections

These authoritative resources support category-level nomenclature, terminology, identification methods, and safety. When a specimen-specific safety warning appears, the public-health source listed here directly supports that precaution. They are not line-by-line citations for every other property on this entry, and natural specimens vary.

Editorial owner: GeoMiner
Last updated: 2026-03-30T14:37:05.066637+00:00
Review status: Published; not independently peer-reviewed

IMA–CNMNC List of Mineral Names — International Mineralogical Association. Official mineral-name, nomenclature, and classification records.
Mineral ID Key — Mineralogical Society of America. Physical-property identification methods, repeat-testing guidance, and limitations.

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Common questions

What is Cryolite?: Sodium aluminum fluoride once essential for aluminum smelting. Nearly invisible in water due to similar refractive index.
How can you identify Cryolite?: Compare several properties rather than relying on colour alone. This entry records colour: Colorless to white, brownish; lustre: Vitreous to greasy; streak: White; Mohs hardness: 2.5; cleavage: Poor; crystal system: Monoclinic; transparency: Transparent to translucent. Confirm an important identification with additional field tests or qualified laboratory work.
How does Cryolite form?: Forms in rare alkaline granitic pegmatites. The only major deposit was at Ivigtut, Greenland now exhausted .
Where is Cryolite commonly found?: Greenland Ivigtut, historic , Spain, USA; extremely rare in nature.
What is Cryolite commonly confused with?: Cryolite may be confused with Calcite, Quartz, Feldspar. Compare multiple diagnostic properties because colour and surface appearance can overlap.

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Cryolite identification and geology

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Sources, scope & corrections

Common questions