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Ralstonite & Prosopite

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CR88767

Ralstonite & Prosopite

Rare Mineral

Description Tabs

Description
Locality: 
Ivittuut, Arsuk Fjord, Sermersooq, Greenland
Size Range: 
Thumbnail (1-3cm)
Size: 
2.7 × 1.7 × 1.2 cm
Description

Gemmy white ralstonite octahedrons on a bed of crystallized prosopite from an old collection. Very good small specimen.

Mineral Data
What's on the rock

Hydrokenoralstonite

Formula: 
NaMg[Al(F,OH)6]·H2O
Group Parent: 
Pyrochlore Supergroup
Strunz: 
3/C.03-60
Crystal System: 
Isometric
Hardness: 
4.5
Colour: 
Colourless, white
Streak: 
White
Type Locality: 
Ivigtut Cryolite deposit, Ivittuut (Ivigtut), Arsuk Fjord, Sermersooq, Greenland

Prosopite

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