Fluorcanasite
A rare potassium-sodium-calcium fluoride-silicate discovered in 2003 in mine dumps at Kirovsk, Russia.
Intro adapted from Wikipedia (CC BY-SA).
Fluorcanasite is an IMA-recognized mineral species in the silicate class, with the chemical formula K₃Na₃Ca₅Si₁₂O₃₀F₄·H₂O.
It crystallizes in the monoclinic crystal system (space group Cm).
Key properties: Mohs hardness 5; specific gravity 2.68; White streak; Vitreous luster; optically biaxial.
IMA symbol Fcns, IMA status: approved, named in 2007.
Found in hyperalkaline pegmatite in an alkaline massif.
It is found associated with Microcline, nepheline, aegirine, scherbakovite, lamprophyllite, pectolite, mosandrite, villiaumite, rasvumite, molybdenite.
The suffix, fluor, identifies the fluorine-dominant analogy of canasite.