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Sillimanite
Sillimanite
☒

Andesine
Andesine
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Tough
-
-
3.20-3.26
Splintery
{010} perfect
6-7.5
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
 
Brittle
-
-
2.65-2.69
Uneven, Conchoidal
Perfect on {001}, good on {010}
6-6.5
(Na,Ca)Al1-2Si3-2O8

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Vivianite
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Andesine Vs Starlite
Andesine
Strontium Titanate
Andesine Vs Strontium Titanate

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