Nice specimen of this rare arsenate of aluminium, with well shaped green coloured crystals over the surface.
Formula :
Al[AsO4] * 2 H2O
System: orthorhombic Hardness:3½-4 Rarity:not common
Strunz id:VII/C.9-70 -
PHOSPHATES, ARSENATES and VANADATES
Name origin: After George R. Mansfield (1875-1947), American geologist, U.S. Geological Survey.
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 Specimen weight:125 gr.
 Crystal size:Up to 1 mm
 Overall size: 55mm x 40 mm x 40 mm
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