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Sanidine

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PDM776964

Sanidine

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Description
Locality: 
Roc de Courlande, Chastreix, Monts-Dore, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.7 × 5.6 × 5.2 cm
Largest Crystal: 
4.40cm
Description

Good representative specimen of karlsbad-twinned sanidine crystals to 44 mm in length on a matrix of trachy-andesite from the French locality of Roc de Courlande.

Ex. Nicolas Bouvin specimen.

Mineral Data
What's on the rock

Sanidine

Formula: 
KAlSi3O8
Strunz: 
9.FA.30
Crystal System: 
Monoclinic - Prismatic
Hardness: 
6.0
Streak: 
White
Type Locality: 
Drachenfels, Königswinter, Siebengebirge, North Rhine-Westphalia, Germany

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