General Information:
Chemical Formula:
(Al,Fe+++)3(AsO4)(OH)6·5(H2O)
Composition:
(Molecular Weight = 440.85 gm)
Aluminum 12.24 % Al
Iron 12.67 % Fe
Arsenic 16.99 % As
Hydrogen 3.66 % H
Oxygen 54.44 % O
Empirical Formula:
Al2Fe3+(AsO4)(OH)6·5(H2O)
Environment:
Secondary mineral.
Locality:
Liskeard, Cornwall, England.
Name Origin:
Named for the locality.
Physical Properties:
Cleavage:
[???] Good
Color:
bluish, bluish white, brownish white, greenish, or greenish white.
Density:
3.1
Habits:
Encrustations - Forms crust-like aggregates on matrix., ,
Hardness:
1-2 - Between Talc and Gypsum
Streak:
white
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