General Information:
Chemical Formula:
beta-Mn+++O(OH)
Composition:
(Molecular Weight = 87.94 gm)
Manganese 62.47 % Mn
Hydrogen 1.15 % H
Oxygen 36.39 % O
Empirical Formula:
Mn3+O(OH)
Environment:
Alteration product of Mn ores.
IMA Status:
Approved IMA 1966
Locality:
Franklin, Sussex County, New Jersey, USA.
Name Origin:
Named for Walter Feitknecht (1899-1975), Swiss, professor of chemistry, University of Bern.
Physical Properties:
Color:
brownish black or black.
Density:
3.8
Diaphaniety:
Translucent to Subopaque
Habits:
Thin - Flat dimensioned crystals., Hexagonal - Six-sided crystal shape in cross-section or habit., Platy - Sheet forms (e.g. micas).
Luster:
Earthy (Dull)
Streak:
brown
More details...