Prosopite, Thomsonite, Ralstonite from Ivigtut, GreenlandM Cole (Howie G. collection)Feb 2, 2017Prosopite can forms as an alteration product in cryolite-bearing pegmatites, either as a primary mineral or as an alteration product of cryolite. Shown under shortwave UV.
Prosopite can forms as an alteration product in cryolite-bearing pegmatites, either as a primary mineral or as an alteration product of cryolite. Shown under shortwave UV.