Annabergite and Afghanite Physical Properties

Annabergite

Afghanite

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1 Physical Properties

1.1 Tenacity

Sectile

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.072.55-2.65

1 7.18

1.5 Fracture

Brittle, Metallic, Brittle, Metallic, Brittle, Metallic

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

1.6 Cleavage

Perfect on {010}, indistinct on {100} and {102}

Perfect {10 1 0}

1.7 Mohs Hardness

25.5-6

2 10

1.8 Chemical Composition

Ni3(AsO4)2•8(H2O)

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

Annabergite and Afghanite Chemical Formula

While comparing Annabergite 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 Annabergite and Afghanite chemical formula.

Chemical formula of Annabergite- Ni3(AsO4)2•8(H2O)
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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Annabergite and Afghanite Specific Gravity

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