Polyhalite and Sillimanite Physical Properties

Polyhalite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.783.20-3.26

1 7.18

1.5 Fracture

Conchoidal, Brittle

Splintery

1.6 Cleavage

Perfect on {10 1 }; parting on {010}

{010} perfect

1.7 Mohs Hardness

3.56-7.5

2 10

1.8 Chemical Composition

Not Available

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

Polyhalite and Sillimanite Chemical Formula

While comparing Polyhalite 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 Polyhalite and Sillimanite chemical formula.

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

Compare Red Gemstones

Polyhalite Vs Heliotrope

Polyhalite Vs Vanadinite

Polyhalite Vs Jacinth

Polyhalite and Sillimanite Specific Gravity

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