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Ralstonite

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CR510871

Ralstonite

Type Locality
Classic Locality

Description Tabs

Description
Locality: 
Ivittuut, Arsuk Fjord, Sermersooq, Greenland
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 5.3 × 4 cm
Description

Very rich specimen of large and gemmy, octehedral ralstonite crystals with minor thomsenolite from the type locality of ralstonit.

Old time 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