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Prosopite & Thomsenolite

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ALB98973

Prosopite & Thomsenolite

Description Tabs

Description
Locality: 
Ivittuut, Arsuk Fjord, Sermersooq, Greenland
Size Range: 
Thumbnail (1-3cm)
Size: 
1.2 × 1 × 1 cm
Largest Crystal: 
0.05cm
Description

Tiny gemmy crystals of prosopite, associated with thomsenolite and probably cryolite.

Mineral Data
What's on the rock

Prosopite

Formula: 
CaAl2(F,OH)8
Strunz: 
3.CD.10
Crystal System: 
Monoclinic
Hardness: 
4.5
Type Locality: 
Tin mine, Altenberg, Erzgebirge, Saxony, Germany

Thomsenolite

Formula: 
NaCa[AlF6]·H2O
Strunz: 
3.CB.40
Hardness: 
2.0
Streak: 
White
Type Locality: 
Ivigtut Cryolite deposit, Ivittuut (Ivigtut), Arsuk Fjord, Sermersooq, Greenland

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