General Information:
Chemical Formula:
Zn5CaFe+++2(AsO4)6·14(H2O)
Composition:
(Molecular Weight = 1,564.45 gm)
Calcium 2.56 % Ca
Zinc 20.90 % Zn
Iron 7.14 % Fe
Arsenic 28.73 % As
Hydrogen 1.80 % H
Oxygen 38.86 % O
Empirical Formula:
Zn5CaFe3+2(AsO4)6·14(H2O)
Environment:
May be the Zn analog of smolianinovite.
IMA Status:
Approved IMA
Locality:
Tsumeb, Namibia.
Name Origin:
Named for Rolfe Fahle of Munich, Germany, a mineral dealer specializing in Tsumeb specimens.
Physical Properties:
Cleavage:
[???] Perfect
Color:
gray, gray green, light green, or straw yellow.
Density:
2.1 - 3.16, Average = 2.63
Diaphaniety:
Transparent
Habits:
Fibrous - Crystals made up of fibers., Aggregates - Made of numerous individual crystals or clusters.,
Hardness:
2 - Gypsum
Luster:
Silky - Pearly
More details...