Keystoneite

General Information:
 Chemical Formula:
Mg0.5[Ni++Fe++(TeO3)3]·4.5(H2O)
 Composition:
(Molecular Weight = 734.55 gm)
Magnesium 1.65 % Mg
Iron 7.60 % Fe
Nickel 7.99 % Ni
Tellurium 52.11 % Te
Hydrogen 1.23 % H 
Oxygen 29.40 % O 
 Empirical Formula:
Mg0.5NiFe2+(TeO3)3·4.5(H2O)
 IMA Status:
Approved IMA
Physical Properties:
 Color:
golden yellow.
 Density:
4.4
 Luster:
Adamantine
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