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Offretite Montmorillonite

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ZLT857521

Offretite Montmorillonite

Type Locality

Description Tabs

Description
Locality: 
Mont Semiol, Châtelneuf, Loire, Auvergne-Rhône-Alpes, France
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.4 × 2.5 × 2.4 cm
Description

Vesicular basaltic rock sample with vugs showing long prismatic offretite crystals with montmorillonite. FOV 2.1 mm.

Mineral Data
What's on the rock

Offretite

Formula: 
KCaMgAl5Si13O36·16H2O or near
Strunz: 
9.GD.25
Hardness: 
4.0 - 4.5
Type Locality: 
Mont Semiol (Mont Semiouse; Mont Simiouse), Châtelneuf, Saint-Georges-en-Couzan, Loire, Rhône-Alpes, France

Montmorillonite

Formula: 
(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2·nH2O
Strunz: 
9.EC.40
Hardness: 
1.0 - 2.0
Streak: 
white
Type Locality: 
Montmorillon, Vienne, Poitou-Charentes, France

Seller Information

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