General Information:
Chemical Formula:
MnO(OH)
Composition:
(Molecular Weight = 87.94 gm)
Manganese 62.47 % Mn
Hydrogen 1.15 % H
Oxygen 36.39 % O
Empirical Formula:
Mn3+O(OH)
Name Origin:
Named after its chemical composition.
Physical Properties:
Cleavage:
[010] Perfect
Color:
black, gray, or grayish black.
Density:
4.3 - 4.4, Average = 4.34
Diaphaniety:
Opaque
Habits:
Pseudo Orthorhombic - Crystals show an orthorhombic shape., Massive - Fibrous - Distinctly fibrous fine-grained forms., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmalin e).
Hardness:
4 - Fluorite
Luminescence:
None.
Luster:
Sub Metallic
Streak:
dark brown
More details...