General Information:
Chemical Formula:
NaCaMn3[Si5O14(OH)]
Composition:
(Molecular Weight = 609.31 gm)
Sodium 3.77 % Na
Calcium 6.58 % Ca
Manganese 27.05 % Mn
Silicon 23.05 % Si
Hydrogen 0.17 % H
Oxygen 39.39 % O
Empirical Formula:
NaCaMn2+3Si5O14(OH)
IMA Status:
Approved IMA 1978
Locality:
Franklin, Sussex County, New Jersey, USA.
Name Origin:
Named for Marion Stuart of Bellvue, Idaho, who has been a staunch supporter of the preservation of natural history specimens, particularly those of geological interest.
Physical Properties:
Cleavage:
[100] Indistinct, [001] Indistinct
Color:
white or light pink.
Density:
3.46
Diaphaniety:
Transparent to Translucent
Habits:
Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape., ,
Hardness:
6 - Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
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