Fluorcaphite
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]
| Fluorcaphite | |
|---|---|
 | |
| 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 ų (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 |
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