Topaz and Afghanite Physical Properties

Topaz

Afghanite

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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

3.49-3.572.55-2.65

1 7.18

1.4 Fracture

Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle

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

1.5 Cleavage

[001] Perfect

Perfect {10 1 0}

1.6 Mohs Hardness

85.5-6

2 10

1.9 Chemical Composition

Al₂SiO₄(F,OH)₂

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

Topaz and Afghanite Chemical Formula

While comparing Topaz 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 Topaz and Afghanite chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂
Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)

Compare Gems for Sagittarius

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Topaz Vs Quartz Smoky

Topaz and Afghanite Specific Gravity

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