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Offretite & Calcite

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ZLT118891

Offretite & Calcite

Description Tabs

Description
Locality: 
Ölberg, Hundsangen, Westerwald, Rhineland-Palatinate, Germany
Size Range: 
Small miniature (3-4.5 cm)
Size: 
2 × 3.5 × 3 cm
Description

Basaltic rock sample with a 20 mm vug, densly covered with radiating aggregates of offretite with some calcite and clay minerals. Collected on 2007.

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

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

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