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Sillimanite
Sillimanite

Oligoclase
Oligoclase



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Sillimanite
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Oligoclase

Sillimanite and Oligoclase Physical Properties

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)
 
-
-
-
2.62-2.67
Uneven
From the Greek, oligos and kasein, little cleavage.
6-6.5
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael O’Donoghue , Gems, Sixth Edition (2006)

Sillimanite and Oligoclase Chemical Formula

While comparing Sillimanite and Oligoclase 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 Sillimanite and Oligoclase chemical formula.

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Sillimanite and Oligoclase Specific Gravity

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