Afghanite and Sillimanite Physical Properties

Afghanite

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

2.55-2.65

3.20-3.26

1.5 Fracture

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle

Splintery

1.6 Cleavage

Perfect {10 1 0}

{010} perfect

1.7 Mohs Hardness

5.5-6

6-7.5

1.8 Chemical Composition

(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)

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

Afghanite and Sillimanite Chemical Formula

While comparing Afghanite 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 Afghanite and Sillimanite chemical formula.

Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Compare Blue Gemstones

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Afghanite and Sillimanite Specific Gravity

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