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Allophane

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RPL915680

Allophane

Fluorescent

Description Tabs

Description
Locality: 
New East Wheal Russell, Tavistock, Devon, United Kingdom
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.3 × 5.2 × 3 cm
Largest Crystal: 
0.10cm
Weight: 
44.00gr
Description

Pale blue botryoidal masses of allophane cover areas on this specimen. Typically, there is some "crackling" from partial dehydration.

The allophane displays typical dark blue fluorescence under SW UV but also lime green.

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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