Johninnesite

General Information:
 Chemical Formula:
Na2Mn++9(Mg,Mn++)7(OH)8(AsO4)2(Si6O17)2
 IMA Status:
Approved IMA 1985
Physical Properties:
 Cleavage:
[100] Distinct
 Color:
yellow brown.
 Density:
3.48
 Hardness:
5-6 - Between Apatite and Orthoclase
 Luster:
Vitreous (Glassy)
 Streak:
brownish yellow
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