General Information:
Chemical Formula:
Mn++3Mn+++(AsO4)(OH)6
Composition:
(Molecular Weight = 460.72 gm)
Manganese 47.70 % Mn
Arsenic 16.26 % As
Hydrogen 1.31 % H
Oxygen 34.73 % O
Empirical Formula:
Mn2+3Mn3+(AsO4)(OH)6
Environment:
Metamorphosed Zn-Mn deposit.
IMA Status:
Approved IMA 1982
Locality:
Franklin, Sussex County, New Jersey, USA.
Name Origin:
Named for Eugene Jaroswich (1926-), chief chemist, Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution.
Physical Properties:
Cleavage:
None
Color:
dark red.
Density:
3.66
Habits:
Aggregates - Made of numerous individual crystals or clusters., Divergent - Crystals radiate from a center without producing stellar forms.,
Hardness:
4 - Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
reddish orange
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