Afghanite and Chalcedony Physical Properties

Afghanite

Chalcedony

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.65

2.55-2.70

1.5 Fracture

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

Uneven, Splintery, Conchoidal, Uneven, Splintery, Conchoidal, UnevenWalter Schumann

1.6 Cleavage

Perfect {10 1 0}

Absent

1.7 Mohs Hardness

5.5-6

6.5-7

1.8 Chemical Composition

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

SiO₂

Afghanite and Chalcedony Chemical Formula

While comparing Afghanite and Chalcedony 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 Chalcedony 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 Chalcedony- SiO₂

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Afghanite and Chalcedony Specific Gravity

Another important criteria for qualitative analysis of gemstones is Afghanite and Chalcedony Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Afghanite and Chalcedony Optical Properties during the identification of gemstone. Specific gravity of Afghanite is 2.55-2.70 whereas that of Chalcedony is 2.55-2.70.