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Zoisite
Zoisite

Sillimanite
Sillimanite



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Zoisite
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Sillimanite

Zoisite and Sillimanite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.20-3.50
Uneven, Conchoidal, Even
Perfect {010} imperfect {100}
6-7
Ca2Al3(SiO4)3(OH)
 
Tough
-
-
3.20-3.26
Splintery
{010} perfect
6-7.5
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)

Zoisite and Sillimanite Chemical Formula

While comparing Zoisite and Sillimanite 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 Zoisite and Sillimanite chemical formula.

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Zoisite and Sillimanite Specific Gravity

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