Fluorite and Sillimanite Physical Properties

Fluorite

Sillimanite

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Physical Properties

Tenacity

Brittle

Tough

Solubility

slightly water soluble and in hot hydrochloric acid

Durability

Specific Gravity

3.00-3.253.20-3.26

1 7.18

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Fracture

Subconchoidal, Uneven, ConchoidalWalter Schumann

Splintery

Cleavage

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

{010} perfect

Mohs Hardness

46-7.5

2 10

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Chemical Composition

CaF₂

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

Fluorite and Sillimanite Chemical Formula

While comparing Fluorite 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 Fluorite and Sillimanite chemical formula.

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

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Fluorite and Sillimanite Specific Gravity

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