Afghanite and Erythrite Physical Properties

Afghanite

Erythrite

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1 Physical Properties

1.1 Tenacity

Not Available

Sectile

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.653.06

1 7.18

1.5 Fracture

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

Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

1.6 Cleavage

Perfect {10 1 0}

Perfect on {010}; poor on {100} and { 1 02}.

1.7 Mohs Hardness

5.5-6Not Available

2 10

1.8 Chemical Composition

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

Co3(AsO4)2•8(H2O)

Afghanite and Erythrite Chemical Formula

While comparing Afghanite and Erythrite 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 Erythrite 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 Erythrite- Co3(AsO4)2•8(H2O)

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Afghanite and Erythrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Afghanite and Erythrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Afghanite and Erythrite Optical Properties during the identification of gemstone. Specific gravity of Afghanite is 3.06 whereas that of Erythrite is 3.06.