Kyanite and Afghanite Physical Properties

Kyanite

Afghanite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.53-3.652.55-2.65

1 7.18

1.5 Fracture

Splintery, Brittle, Metallic

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

1.6 Cleavage

[100] perfect [010] imperfect with 79° angle between

Perfect {10 1 0}

1.7 Mohs Hardness

4-75.5-6

2 10

1.8 Chemical Composition

Not Available

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

Kyanite and Afghanite Chemical Formula

While comparing Kyanite and Afghanite 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 Kyanite and Afghanite 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)

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Kyanite and Afghanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Kyanite and Afghanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Kyanite and Afghanite Optical Properties during the identification of gemstone. Specific gravity of Kyanite is 2.55-2.65 whereas that of Afghanite is 2.55-2.65.