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Allophane

Type Locality
Gräfenthal, Thuringian Forest, Thuringia, Germany
Mineral Data
(Al2O3)(SiO2)1.3-2·2.5-3H2O
Strunz: 
9.ED.20
Physical Properties
Crystal System: 
Amorphous
Streak: 
White
Hardness: 
3.0
Tenacity: 
brittle
Synonyms
Synonyms: 
Allophan
Photos