General Information:
Chemical Formula:
Ca2Mn+++2Mn++Si2O8(OH)4·9(H2O)
Composition:
(Molecular Weight = 659.30 gm)
Calcium 12.16 % Ca
Manganese 25.00 % Mn
Silicon 8.52 % Si
Hydrogen 3.36 % H
Oxygen 50.96 % O
Empirical Formula:
Ca2Mn3+2Mn2+Si2O8(OH)4·9(H2O)
Environment:
Metamorphosed Mn-Zn deposit.
IMA Status:
Approved IMA 1983
Locality:
Franklin mine, Franklin, New Jersey, USA.
Name Origin:
Named from the Algonquin for "endless hills," in allusion to the topography of the Franklin, New Jersey, area.
Physical Properties:
Cleavage:
[0001] Perfect
Color:
bright yellow.
Density:
2.61
Habits:
Thin - Flat dimensioned crystals., Platy - Sheet forms (e.g. micas).,
Hardness:
4 - Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
light yellow
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