Chiolite

minerals

thomsenolite

pachnolite

cryolite

Images

Formula: Na5Al3F14
Halide
Specific gravity: 2.998
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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