Chiolite

minerals

thomsenolite

pachnolite

cryolite

Images

Formula: Na₅Al₃F₁₄
Halide
Crystal System: Tetragonal
Specific gravity: 2.998 measured, 2.989 calculated
Hardness: 3½ to 4
Streak: White
Colour: Nearly colourless, snow-white
Solubility: Soluble in sulphuric acid and AlCl₃ solution; easily fusible (Dana)
Environments

Pegmatites

Chiolite occurs in some granite pegmatites (Webmin, HOM).

At the type locality, Pit number 69, Chelyabinsk Oblast, Russia, chiolite occurs in a cryolite-bearing pegmatite, associated with topaz, thomsenolite, phenakite, fluorite and cryolithionite (Mindat, Dana).

At the Morefield mine, Amelia, Virginia, USA, chiolite is associated with elpasolite, cryolite, pachnolite, thomsenolite, hydrokenoralstonite and prosopite (Dana, HOM).

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