Gahnite and Mottramite Physical Properties

Gahnite

Mottramite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

4.00-4.625.9

1 7.18

1.5 Fracture

Conchoidal, Uneven

Sub-Conchoidal, Brittle, Metallic

1.6 Cleavage

Indistinct parting on [111]

None observed

1.7 Mohs Hardness

7.5-83

2 10

1.8 Chemical Composition

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

Not Available

Gahnite and Mottramite Chemical Formula

While comparing Gahnite and Mottramite 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 Gahnite and Mottramite chemical formula.

Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Gahnite Vs Howlite

Gahnite and Mottramite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Gahnite and Mottramite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gahnite and Mottramite Optical Properties during the identification of gemstone. Specific gravity of Gahnite is 5.9 whereas that of Mottramite is 5.9.