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Allophane

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SHS39821

Allophane

Description Tabs

Description
Locality: 
Santa Creu d'Olorda, Barcelona, Catalonia, Spain
Size Range: 
Small cabinet (7-10 cm)
Size: 
5.9 × 7.3 × 4 cm
Description

Yellow to white allophane in matrix

Mineral Data
What's on the rock

Allophane

Formula: 
(Al2O3)(SiO2)1.3-2·2.5-3H2O
Strunz: 
9.ED.20
Crystal System: 
Amorphous
Hardness: 
3.0
Streak: 
White
Type Locality: 
Gräfenthal, Thuringian Forest, Thuringia, Germany