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Adularia & Stilbite

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AST858986

Adularia & Stilbite

With Antique Label

Description Tabs

Description
Locality: 
Biel, Grafschaft, Goms, Valais, Switzerland
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.8 × 4 × 3 cm
Description

Razor sharp semi transparent adularia crystals with stilbite attached. Specimen is complete all around with one contact break that serve as specimen's base. More than a century old, comes from the collection of Spiridon Despozitos, mine owner and businessman active in Athens during 1890-1920.

Mineral Data
What's on the rock

Adularia

Formula: 
KAlSi3O8
Strunz: 
9.FA.30
Crystal System: 
Monoclinic
Hardness: 
6 Ortho - clase

Stilbite

Synonym Of: 

Stilbite-Ca

Formula: 
NaCa4[Al9Si27O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0

Stilbite-Na

Formula: 
(Na,Ca,K)6-7[Al8Si28O72]·nH2O
Strunz: 
9.GE.10
Hardness: 
3.5 - 4.0
Hardness: 
3.5 - 4
Colour: 
White
Streak: 
White

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