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Blue John
Blue John

Andalusite
Andalusite



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Blue John
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Andalusite

Blue John and Andalusite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.00-3.25
-
Perfect
-9999
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)
 
-
-
-
3.05-3.21
Uneven, Subconchoidal, Splintery
Good on {110}, poor on {100}
7.5
Al 2SiO 5Michael O’Donoghue , Gems, Sixth edition (2006) More from other references

Blue John and Andalusite Chemical Formula

While comparing Blue John 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 Blue John and Andalusite chemical formula.

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Blue John and Andalusite Specific Gravity

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