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Andalusite and Blue John Physical Properties


Blue John and Andalusite Physical Properties


Physical Properties

Tenacity
Not Available   
Not Available   

Solubility
Not Available   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
3.05-3.21   
3.00-3.25   

Fracture
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)   
Not Available   

Cleavage
Good on {110}, poor on {100}   
Not Available   

Mohs Hardness
7.5   
Not Available   

Chemical Composition
Al 2SiO 5Michael O’Donoghue , Gems, Sixth edition (2006) More from other references   
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)   

Optical Properties >>
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Andalusite and Blue John Chemical Formula

While comparing Andalusite and Blue John 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 Andalusite and Blue John chemical formula.

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Andalusite and Blue John Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Blue John Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Blue John Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 3.00-3.25 whereas that of Blue John is 3.00-3.25.

Brown Gemstones

Brown Gemstones


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