Chalcedony and Afghanite Physical Properties

Chalcedony

Afghanite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.702.55-2.65

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

Absent

Perfect {10 1 0}

1.7 Mohs Hardness

6.5-75.5-6

2 10

1.8 Chemical Composition

SiO₂

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

Chalcedony and Afghanite Chemical Formula

While comparing Chalcedony 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 Chalcedony and Afghanite chemical formula.

Chemical formula of Chalcedony- SiO₂
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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Chalcedony and Afghanite Specific Gravity

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