General Information:
Chemical Formula:
Ca7Fe+++11(AsO4)9O10·24.3(H2O)
Composition:
(Molecular Weight = 2,742.90 gm)
Calcium 10.23 % Ca
Iron 22.40 % Fe
Arsenic 24.58 % As
Hydrogen 1.79 % H
Oxygen 41.01 % O
Empirical Formula:
Ca7Fe3+11(AsO4)9O10·24.3(H2O)
Locality:
Tagish Lake, Yukon Territory, Canada.
Name Origin:
Named for the locality.
Physical Properties:
Color:
brownish black, dark red, or reddish brown.
Density:
2.8
Habits:
Amorphous - No crystalline form or imitative shape., ,
Hardness:
2-3 - Gypsum-Calcite
Luminescence:
Non-fluorescent.
Luster:
Resinous
Streak:
light brown
More details...