Chrysoberyl and Afghanite Physical Properties

Chrysoberyl

Afghanite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.69-3.812.55-2.65

1 7.18

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Fracture

Uneven, Conchoidal to uneven, ConchoidalWalter Schumann

Conchoidal

Cleavage

Distinct on {110}, imperfect on {010}, poor on {001}

Perfect {10 1 0}

Mohs Hardness

8.55.5-6

2 10

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Chemical Composition

BeAl ₂ O ₄

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

Chrysoberyl and Afghanite Chemical Formula

While comparing Chrysoberyl 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 Chrysoberyl and Afghanite chemical formula.

Chemical formula of Chrysoberyl- BeAl ₂ O ₄
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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Chrysoberyl and Afghanite Specific Gravity

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