Halide, dimorph of thomsenolite, which is epitaxial on pachnolite
Specific gravity: 2.98
Colour: Colourless, white; colourless in transmitted light.
Solubility: Soluble in sulphuric acid, easily fusible (Dana)
Pachnolite occurs as as alteration product of cryolite and other alkali
aluminium fluorides, most commonly in pegmatites. Associated minerals include
hydrokenoralstonite, sellaite and
At the type locality, the Ivigtut Cryolite deposit, Sermersooq, Greenland, Denmark, pachnolite occurs as an alteration product of cryolite (Dana), associated with thomsenolite (Mindat).
At Saint Peter's dome, El Paso county, Colorado, USA, pachnolite occurs with thomsenolite, elpasolite and other fluorides (Dana).
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