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	Minerals
Formula	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