Fluorcaphite
Appearance
Fluorcaphite | |
---|---|
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General | |
Category | Mineral |
Formula (repeating unit) | SrCaCa3(PO4)3F |
Strunz classification | 7/B.39-95 |
Crystal system | Hexagonal |
Crystal class | Dipyrimidal |
Space group | P63 (No. 173) |
Unit cell | 545.39 Å3 (calculated from unit cell) |
Identification | |
Formula mass | 671.38 |
Colour | Light to bright yellow |
Crystal habit | Prismatic, subhedral crystals |
Fracture | Sub-conchoidal |
Tenacity | Brittle |
Mohs scale hardness | 5 |
Luster | Vitreous |
Streak | White |
Diaphaneity | Transparent |
Density | 3.60 |
Birefringence | 0.012 |
Fluorcaphite is a mineral with the chemical formula (Ca,Sr,Ce,Na)5(PO4)3F.[1] It is found in the Kola Peninsula in Russia.[2] Its crystals are hexagonal (dipyramidal class) and are transparent with a vitreous luster. It is light to bright yellow, leaves a white streak and is rated five on the Mohs Scale.[3] Fluorcaphite is radioactive.[1]
References
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