Feldspar and Sillimanite Physical Properties

Feldspar

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.56-2.753.20-3.26

1 7.18

1.5 Fracture

Uneven, Conchoidal, Uneven, Conchoidal, Gemstones of the world (2001)

Splintery

1.6 Cleavage

two or three

{010} perfect

1.7 Mohs Hardness

6-6.56-7.5

2 10

1.8 Chemical Composition

Not Available

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

Feldspar and Sillimanite Chemical Formula

While comparing Feldspar 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 Feldspar and Sillimanite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Compare Green Gemstones

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Feldspar and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Feldspar and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Feldspar and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Feldspar is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.