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Andalusite
Andalusite
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Bloodstone
Bloodstone
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Andalusite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
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-
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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
 
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2.63-2.65
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Indiscernible
7
SiO2