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Vishnevite Gonnardite & Orthoclase

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PCZ619518

Vishnevite Gonnardite & Orthoclase

Description Tabs

Description
Locality: 
Allt a'Mhuillin, Loch Borrolan, Sutherland, Scotland, United Kingdom
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 3.5 × 2.5 cm
Description

Vishnevite (blue), Gonnardite (white) and orthoclase (grey). Rarely offered material from a remote British locality.

Mineral Data
What's on the rock

Vishnevite

Formula: 
(Na,K)8(Al6Si6O24)(SO4,CO3)·2H2O
Strunz: 
9.FB.05
Hardness: 
5.0 - 6.0
Streak: 
white
Type Locality: 
Kurochkin Log, Vishnevye Mts (Vishnyovye; Cherry), Chelyabinsk Oblast', Southern Urals, Urals Region, Russia...

Gonnardite

Formula: 
(Na,Ca)2(Si,Al)5O10·3H2O
Strunz: 
9.GA.05
Hardness: 
4.0 - 5.0
Type Locality: 
La Chaux de Bergonne, Gignat, Saint-Germain-Lembron, Puy-de-Dôme, Auvergne, France

Orthoclase

Formula: 
KAlSi3O8
Strunz: 
9.FA.30
Hardness: 
6.0
Streak: 
White

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$10
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Start 14 Nov 18:00
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$7

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