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Allophane

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MMM51192

Allophane

Description Tabs

Description
Locality: 
New East Wheal Russell, Tavistock, Devon, United Kingdom
Size Range: 
Small miniature (3-4.5 cm)
Size: 
2 × 3 × 2 cm
Description

A small but choice specimen of sky blu allophane coating crystalline quartz on slate matrix.

Fluoresces under UV light

Collected from Adit Level in 1995.

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