Difference between revisions of "Cryolite"
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sodium aluminum fluoride; Greenland spar; icestone; ice stone; criolita (Esp.); cryolite (Fr.); Kryolit (Deut.) | sodium aluminum fluoride; Greenland spar; icestone; ice stone; criolita (Esp.); cryolite (Fr.); Kryolit (Deut.) | ||
| − | == | + | == Risks == |
| − | + | * Toxic by ingestion and inhalation. May cause dental and bone defects. Gives off poisonous fluorine gas during firing. | |
| + | * American Elements: [https://www.sigmaaldrich.com/US/en/product/sial/01713 SDS] | ||
| + | == Physical and Chemical Properties == | ||
| − | Monoclinic, prismatic crystals usually | + | * Soluble in concentrated sulfuric acid. Taste is slightly salty. |
| − | + | * Monoclinic, prismatic crystals usually occurring in masses or granules. | |
| − | Fracture = uneven. Luster = vitreous to greasy. Streak = white. | + | * Fracture = uneven. |
| + | * Luster = vitreous to greasy. | ||
| + | * Streak = white. | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 24: | Line 28: | ||
|- | |- | ||
! scope="row"| Melting Point | ! scope="row"| Melting Point | ||
| − | | 1000 | + | | 1000 C |
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 2.95-3.0 | + | | 2.95-3.0 g/ml |
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
| Line 33: | Line 37: | ||
|} | |} | ||
| − | == | + | == Resources and Citations == |
| − | |||
| − | |||
| − | |||
| − | |||
| − | Mineralogy Database: [http://www.webmineral.com/data/Cryolite.shtml Cryolite] | + | * Mineralogy Database: [http://www.webmineral.com/data/Cryolite.shtml Cryolite] |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 15:21, 7 July 2022
Description
White, translucent crystalline mineral composed of sodium aluminum fluoride. Cryolite occurs naturally in Greenland (Ivigtut) with smaller sources located Spain, U.S.(Colorado) and Russia. It may also be made synthetically by fusing sodium fluoride and aluminum fluoride. Cryolite is used as a flux and opacifier in porcelain enamel. It is also used to make opalescent glass.
Synonyms and Related Terms
sodium aluminum fluoride; Greenland spar; icestone; ice stone; criolita (Esp.); cryolite (Fr.); Kryolit (Deut.)
Risks
- Toxic by ingestion and inhalation. May cause dental and bone defects. Gives off poisonous fluorine gas during firing.
- American Elements: SDS
Physical and Chemical Properties
- Soluble in concentrated sulfuric acid. Taste is slightly salty.
- Monoclinic, prismatic crystals usually occurring in masses or granules.
- Fracture = uneven.
- Luster = vitreous to greasy.
- Streak = white.
| Composition | Na3AlF6 |
|---|---|
| Mohs Hardness | 2.5 |
| Melting Point | 1000 C |
| Density | 2.95-3.0 g/ml |
| Refractive Index | 1.338;1.338;1.339 |
Resources and Citations
- Mineralogy Database: Cryolite