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Allophane

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ZLT524353

Allophane

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Description
Locality: 
Manuel-Mercedes Open Pit, Cala, Huelva, Andalusia, Spain
Class: 
Combination
Size Range: 
Thumbnail (1-3cm)
Size: 
1 × 1.8 × 1.2 cm
Description

Limonitic matrix covered with transparent, blue, botryoidal aggragates of allophane

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

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