Afghanite and Emerald Physical Properties

Afghanite

Emerald

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

Hard

1.4 Specific Gravity

2.55-2.65

2.67-2.78

1.5 Fracture

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

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

Perfect {10 1 0}

Imperfect on the [0001]

1.7 Mohs Hardness

5.5-6

7.5-8

1.8 Chemical Composition

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

Be₃Al₂SiO₆

Afghanite and Emerald Chemical Formula

While comparing Afghanite and Emerald 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 Emerald 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 Emerald- Be₃Al₂SiO₆

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Afghanite and Emerald Specific Gravity

Another important criteria for qualitative analysis of gemstones is Afghanite and Emerald Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Afghanite and Emerald Optical Properties during the identification of gemstone. Specific gravity of Afghanite is 2.67-2.78 whereas that of Emerald is 2.67-2.78.