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Biotite
Biotite

Jeremejevite
Jeremejevite



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Biotite
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Jeremejevite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
-
-
2.7-3.3
Uneven, Even
Perfect on the {001}
2.5-3.0
K(Mg,Fe++)3[AlSi3O10(OH,F)2
 
-
-
-
3.28-3.31
Conchoidal
None observed
6.5-7.5
Al 6B 5O 15(F,OH) 3Ulrich Henn and Claudio C.