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Thomsenolite Ralstonite & Siderite

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HCH50023

Thomsenolite Ralstonite & Siderite

Description Tabs

Description
Locality: 
Ivittuut, Arsuk Fjord, Sermersooq, Greenland
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 5 × 4 cm
Largest Crystal: 
0.50cm
Description

Prismatic and pseudocubic white thomsenolite crystals partly covered by thinn crust of limonite near small ralstonite crystals up to 1 mm and massive brown siderite on matrix.

The thomsenolite are in the pseudocubic habit up to 5 mm large, as prismatic crystals 2 mm large.

Mineral Data
What's on the rock

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

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

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

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