Prosopite

ソップ
0.96 ct.
Trillion Cut
7.00 x 7.00 x 4.09 mm
max6896

Prosopite

is a Fluoride of Calcium and Aluminium with formula CaAl2(F,OH)8 and hardness of 4-5.

Occur in microcrystalline of bluish color here inter grow with massive aggregates of prismatic Thomsenolite and Ralstonite. A rare and inusual mineral

from Ivigtut Cryolite deposit, Ivigtut,Arsuk Fjord,Kitaa Prov. / Greenland.