General Information:
Chemical Formula:Mn++3Mn+++(AsO4)(OH)6
Composition:(Molecular Weight = 460.72 gm)Manganese 47.70 %
MnArsenic 16.26 %
AsHydrogen 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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