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Biotite
Biotite

Grandidierite
Grandidierite



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Biotite
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Grandidierite

Biotite and Grandidierite Physical Properties

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
 
-
-
-
2.85-3.00
Uneven
Perfect
7.5
(Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.

Biotite and Grandidierite Chemical Formula

While comparing Biotite and Grandidierite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Biotite and Grandidierite chemical formula.

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Biotite and Grandidierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Grandidierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite Vs Grandidierite during the identification of gemstone. Specific gravity of Biotite is whereas that of Grandidierite is .