Peridot and Sillimanite Physical Properties

Peridot

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

1.54-1.553.20-3.26

1 7.18

1.5 Fracture

Conchoidal

Splintery

1.6 Cleavage

Poor

{010} perfect

1.7 Mohs Hardness

6.5-76-7.5

2 10

1.8 Chemical Composition

(Mg,Fe)₂SiO₄

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

Peridot and Sillimanite Chemical Formula

While comparing Peridot 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 Peridot and Sillimanite chemical formula.

Chemical formula of Peridot- (Mg,Fe)₂SiO₄
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Compare Semi Precious Gemstones

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Peridot Vs Garnet

Peridot Vs Hackmanite

Peridot and Sillimanite Specific Gravity

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