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Faujasite Opal & Offretite

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ZLT210200

Faujasite Opal & Offretite

Description Tabs

Description
Locality: 
Limberg Quarries, Sasbach am Kaiserstuhl, Freiburg Region, Baden-Württemberg, Germany
Size Range: 
Thumbnail (1-3cm)
Size: 
1 × 1.5 × 1.1 cm
Description

Coated octhedrons of faujasite with hemispheres of opal and very small prismatic offretite. Collected in the 1970´s.

Mineral Data
What's on the rock

Faujasite

Group Parent: 
Faujasite Subgroup

Opal

Formula: 
SiO2·nH2O
Strunz: 
4.DA.10
Hardness: 
5.5 - 6.5
Streak: 
White

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

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