Gypsum and Gahnite Physical Properties

Gypsum

Gahnite

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1 Physical Properties

1.1 Tenacity

Flexible

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.20-2.404.00-4.62

1 7.18

1.5 Fracture

Conchoidal, Splintery, Fibrous, UnevenArthur Thomas, Gemstones (2009)

Conchoidal, Uneven

1.6 Cleavage

Perfect on {010}, distinct on {100}

Indistinct parting on [111]

1.7 Mohs Hardness

27.5-8

2 10

1.8 Chemical Composition

CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)

ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

Gypsum and Gahnite Chemical Formula

While comparing Gypsum and Gahnite 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 Gypsum and Gahnite chemical formula.

Chemical formula of Gypsum- CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Gypsum and Gahnite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Gypsum and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gypsum and Gahnite Optical Properties during the identification of gemstone. Specific gravity of Gypsum is 4.00-4.62 whereas that of Gahnite is 4.00-4.62.