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Biotite and Andalusite Physical Properties


Andalusite and Biotite Physical Properties


Physical Properties

Tenacity
Brittle   
Not Available   

Solubility
Not Available   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
2.7-3.3   
3.05-3.21   

Fracture
Uneven, Even, Yellow, White   
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)   

Cleavage
Perfect on the {001}   
Good on {110}, poor on {100}   

Mohs Hardness
2.5-3.0   
7.5   

Chemical Composition
K(Mg,Fe++)3[AlSi3O10(OH,F)2   
Al 2SiO 5Michael O’Donoghue , Gems, Sixth edition (2006) More from other references   

Optical Properties >>
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Biotite and Andalusite Chemical Formula

While comparing Biotite and Andalusite 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 Andalusite chemical formula.

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Biotite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.

Yellow Gemstones

Yellow Gemstones


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