General Information:
Chemical Formula:(Mn,Ag,Ca)Mn++++3O7·3(H2O)
Composition:(Molecular Weight = 398.70 gm)Calcium 2.01 %
CaManganese 48.23 %
MnSilver 8.12 %
AgHydrogen 1.52 %
H Oxygen 40.13 %
O Empirical Formula: Mn2+0.5Ag0.3Ca0.2Mn3+3O7·3(H2O)
IMA Status:Approved IMA 1967
Locality:Aurora mine, Treasure Hill, Hamilton, Nevada, USA.
Name Origin:Named for the locality.
Physical Properties: Color:grayish black or black.
Density:3.8 - 4.1, Average = 3.95
Diaphaniety:Opaque
Habits:Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks., Platy - Sheet forms (e.g. micas)., Scaly - Morphology like fish scales.
Hardness:2-3 - Gypsum-Calcite
Luster:Metallic
Streak:brown
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