General Information:
Chemical Formula:
NaBa3(Mn++,Mn+++)4Si6O19(OH)3
Composition:
(Molecular Weight = 1,178.25 gm)
Barium 34.97 % Ba
Sodium 1.95 % Na
Manganese 18.65 % Mn
Silicon 14.30 % Si
Hydrogen 0.26 % H
Oxygen 29.87 % O
Empirical Formula:
NaBa3Mn2+3Mn4+Si6O19(OH)3
Environment:
At the contact between braunite ore and alkali basalt.
IMA Status:
Approved IMA
Locality:
The Ir-Nimi manganese deposit, Taikan Ridge, Far East, Russia.
Name Origin:
For N. M Strakhov (1900-1978), for his contributions to the study of sedimentary ore deposits and phosphorites.
Physical Properties:
Cleavage:
[110] Imperfect
Color:
black, greenish black, or dark olive green.
Density:
3.86
Diaphaniety:
Translucent
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., ,
Hardness:
5-6 - Between Apatite and Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Greasy
Streak:
green
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