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Allophane

#PD30942
SOLD
Allophane from Hawkswood Mine, Liskeard, Cornwall, England - PD30942
Allophane from Hawkswood Mine, Liskeard, Cornwall, England - PD30942

Allophane

#PD30942
Availability
Sold
Size
7 x 5 x 5 cm - Sm Cabinet 
Formula
Al2O3(SiO2)1.3-2.0·2.5-3.0H2O (RRUFF)
Locality
Hawkswood Mine, Liskeard, Cornwall, England

Yellow, amorphous crusts on matrix. Interesting looking waxy stuff. It is an amorphous hydrous aluminum silicate considered a mineral by IMA standards pre 1959. 

Allophane

Formula
Al2O3(SiO2)1.3-2.0·2.5-3.0H2O 
Crystal System
No Crystals 
Crystal Habit
Encrustations, Stalactitic, Botryoidal 
Cleavage
None, None, None 
Luster
Waxy 
Color
white, green, blue, yellow, brown 
Streak
white 
Class
Amorphous - No Crystals 
Fracture
Conchoidal 
Hardness
3 

Data courtesy of Webmineral.

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