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Offretite & Hyalite

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ZLT146804

Offretite & Hyalite

Description Tabs

Description
Locality: 
Limberg Quarries, Sasbach am Kaiserstuhl, Freiburg Region, Baden-Württemberg, Germany
Size Range: 
Thumbnail (1-3cm)
Size: 
1.1 × 1.6 × 1.3 cm
Description

Selected limburgite sample with a vug lined with two different forms of offretite. Very small mushroom like aggregates and a radiating form with hyalite similar to sea urchins. Funny view under the microscope.

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

Hyalite

Variety Of: 

Opal

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

Seller Information

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