(Min.) A fluoride of aluminium, calcium, and sodium occurring with the cryolite of Greenland.
thomsenolite
thomsenolite
[′täm·sə·nə‚līt] (mineralogy) NaCaAlF6·H2O A colorless to white, monoclinic mineral consisting of a hydrated aluminofluoride of sodium and calcium; it is dimorphous with pachnolite.