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Thomsonite

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MGR704165

Thomsonite

Description Tabs

Description
Locality: 
Mulafjall Mountain, Hvalfjörður, Kjósarhreppur, Capital Region, Iceland
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.9 × 4.7 × 3 cm
Description

Generally minerals from Iceland are very rare, but this specimen represents a great rarity - and it is not just a sample, it is also very eye-catching. A vug of snowy white speheres framed with dark, nearly black matrix - the assemble is very aesthetic and shows a lot of contrast. Should be high ranked for rarity and locality.

Mineral Data
What's on the rock

Thomsonite

Synonym Of: 

Thomsonite-Ca

Formula: 
NaCa2[Al5Si5O20]·6H2O
Strunz: 
9.GA.10
Hardness: 
5.0 - 5.5

Thomsonite-Sr

Formula: 
Na(Sr,Ca)2[Al5Si5O20]·7H2O
Strunz: 
9.GA.10
Hardness: 
5.0 - 0.0