Arctite

Arctite (Na₂Ca₄(PO₄)₃F) is a colourless mineral found in the Kola Peninsula northern Russia.^[1] Its IMA symbol is Arc.^[2] It has a Mohs hardness of 5 and has a specific gravity of 3.13. Arctite is transparent with a vitreous lustre. Arctite has a perfect cleavage and a trigonal crystal system.^[3] It is also a naturally occurring antiperovskite.^[4]

Arctite
Arctite crystals
General
Category	Minerals
Formula	(Na2Ca4(PO4)3F)
IMA symbol	Arc
Identification
Color	Colorless
Mohs scale hardness	5
Luster	Vitreous, Sub-Vitreous, Pearly
Specific gravity	3.13

Common associates of arctite include aegirine, natisite, lomonosovite, umbite and thenardite.^[1]