Afghanite and Peridot Physical Properties

Afghanite

Peridot

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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

2.55-2.65

1.54-1.55

1.5 Fracture

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

Conchoidal

1.6 Cleavage

Perfect {10 1 0}

Poor

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)

(Mg,Fe)₂SiO₄

Afghanite and Peridot Chemical Formula

While comparing Afghanite and Peridot 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 Peridot 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 Peridot- (Mg,Fe)₂SiO₄

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Afghanite and Peridot Specific Gravity

Another important criteria for qualitative analysis of gemstones is Afghanite and Peridot Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Afghanite and Peridot Optical Properties during the identification of gemstone. Specific gravity of Afghanite is 1.54-1.55 whereas that of Peridot is 1.54-1.55.