Afghanite and Star Sapphire Physical Properties

Afghanite

Star Sapphire

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.65

3.90-4.05

1.5 Fracture

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

Not Available

1.6 Cleavage

Perfect {10 1 0}

Not Available

1.7 Mohs Hardness

5.5-6

Not Available

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 2O 3Ulrich Henn and Claudio C.

Afghanite and Star Sapphire Chemical Formula

While comparing Afghanite and Star Sapphire 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 Star Sapphire 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 Star Sapphire- Al 2O 3Ulrich Henn and Claudio C.

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Afghanite and Star Sapphire Specific Gravity

Another important criteria for qualitative analysis of gemstones is Afghanite and Star Sapphire Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Afghanite and Star Sapphire Optical Properties during the identification of gemstone. Specific gravity of Afghanite is 3.90-4.05 whereas that of Star Sapphire is 3.90-4.05.