General Information:
Chemical Formula:
NaCa2Mn++5Fe+++(AsO4)6·2(H2O)
Composition:
(Molecular Weight = 1,303.23 gm)
Sodium 1.76 % Na
Calcium 6.15 % Ca
Manganese 21.08 % Mn
Iron 4.29 % Fe
Arsenic 34.49 % As
Hydrogen 0.31 % H
Oxygen 31.92 % O
Empirical Formula:
NaCa2Mn2+5Fe3+(AsO4)6·2(H2O)
IMA Status:
Approved IMA
Physical Properties:
Cleavage:
[???] Perfect
Color:
dark reddish brown.
Density:
3.8
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
brown
More details...