General Information:
Chemical Formula:
NiMn++++3O7·3(H2O)
Composition:
(Molecular Weight = 389.55 gm)
Manganese 42.31 % Mn
Nickel 15.07 % Ni
Hydrogen 1.55 % H
Oxygen 41.07 % O
Empirical Formula:
NiMn4+3O7·3(H2O)
Environment:
Cavities in chalcedony in a laterized dunite.
IMA Status:
Approved IMA
Locality:
SM7 open pit N of Siberia, Kalgoorlie district, WA, Australia.
Name Origin:
Named for Ernest (Ernie) Henry Nickel (1925-), Canadian-Australian mineralogist, Commonwealth Scientific and Industrial Research Organization (CISRO) and International Mineralogical Association (IMA).
Physical Properties:
Cleavage:
[0001] Perfect
Color:
reddish black.
Density:
3.84
Diaphaniety:
Subtranslucent to Opaque
Habits:
Microscopic Crystals - Crystals visible only with microscopes., Platy - Sheet forms (e.g. micas)., Rosette - Bundled tabular aggregates resembling rose flower petals.
Hardness:
2 - Gypsum
Luster:
Sub Metallic
Streak:
yellowish brown
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