Sillimanite and Fluorite Physical Properties

Sillimanite

Fluorite

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Physical Properties

Tenacity

Tough

Brittle

Solubility

slightly water soluble and in hot hydrochloric acid

Durability

Specific Gravity

3.20-3.263.00-3.25

1 7.18

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Fracture

Splintery

Subconchoidal, Uneven, ConchoidalWalter Schumann

Cleavage

{010} perfect

Octahedral, perfect on {111}, parting on {011}

Mohs Hardness

6-7.54

2 10

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Chemical Composition

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

CaF₂

Sillimanite and Fluorite Chemical Formula

While comparing Sillimanite and Fluorite 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 Fluorite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Fluorite- CaF₂

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Sillimanite and Fluorite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Fluorite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Fluorite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.00-3.25 whereas that of Fluorite is 3.00-3.25.