Hollandite and Afghanite Physical Properties

Hollandite

Afghanite

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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

5.052.55-2.65

1 7.18

1.5 Fracture

Brittle, Metallic

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

1.6 Cleavage

Distinct / Good, Prismatic

Perfect {10 1 0}

1.7 Mohs Hardness

4-65.5-6

2 10

1.8 Chemical Composition

Ba(Mn++++,Mn++)8O16

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

Hollandite and Afghanite Chemical Formula

While comparing Hollandite 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 Hollandite and Afghanite chemical formula.

Chemical formula of Hollandite- Ba(Mn++++,Mn++)8O16
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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Hollandite and Afghanite Specific Gravity

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