Sillimanite and Oligoclase Physical Properties

Sillimanite

Oligoclase

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.262.62-2.67

1 7.18

1.5 Fracture

Splintery

Gems, Sixth Edition (2006), Gems, Sixth Edition (2006), Uneven

1.6 Cleavage

{010} perfect

From the Greek, oligos and kasein, little cleavage.

1.7 Mohs Hardness

6-7.56-6.5

2 10

1.8 Chemical Composition

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , 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.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Oligoclase- Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

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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 and Oligoclase Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.62-2.67 whereas that of Oligoclase is 2.62-2.67.