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 crystals

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

References
  1. Mineral Handbook
  2. Warr, L.N. (2021). "IMA-CNMNC approved mineral symbols". Mineralogical Magazine. 85: 291–320.
  3. Mindat.org
  4. Arctite Supergroup on Mindat
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