Iolite and Afghanite Physical Properties

Iolite

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

2.6-2.72.55-2.65

1 7.18

1.5 Fracture

Not Available

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

1.6 Cleavage

3,1

Perfect {10 1 0}

1.7 Mohs Hardness

7-7.55.5-6

2 10

1.8 Chemical Composition

Mg₂Al₄Si₅O₁₈

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

Iolite and Afghanite Chemical Formula

While comparing Iolite 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 Iolite and Afghanite chemical formula.

Chemical formula of Iolite- Mg₂Al₄Si₅O₁₈
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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Iolite and Afghanite Specific Gravity

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