Afghanite and Goethite Physical Properties

Afghanite

Goethite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

HCl soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.65

4.27-4.29

1.5 Fracture

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

Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).

1.6 Cleavage

Perfect {10 1 0}

Perfect {010}

1.7 Mohs Hardness

5.5-6

5-5.5

1.8 Chemical Composition

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

FeO(OH)Arthur Thomas , Gemstones (2009)

Afghanite and Goethite Chemical Formula

While comparing Afghanite and Goethite 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 Goethite 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 Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)

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Afghanite and Goethite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Afghanite and Goethite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Afghanite and Goethite Optical Properties during the identification of gemstone. Specific gravity of Afghanite is 4.27-4.29 whereas that of Goethite is 4.27-4.29.