Gahnospinel and Polyhalite Physical Properties

Gahnospinel

Polyhalite

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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

3.65-4.552.78

1 7.18

1.5 Fracture

ConchoidalArthur Thomas, Gemstones (2009)

Conchoidal, Brittle

1.6 Cleavage

None, but may exhibit slight parting

Perfect on {10 1 }; parting on {010}

1.7 Mohs Hardness

7.5-83.5

2 10

1.8 Chemical Composition

(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)

Not Available

Gahnospinel and Polyhalite Chemical Formula

While comparing Gahnospinel and Polyhalite 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 Gahnospinel and Polyhalite chemical formula.

Chemical formula of Gahnospinel- (Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)

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Gahnospinel Vs Jeremejevite

Gahnospinel Vs Hydrogrossular

Gahnospinel Vs Indicolite Blue Tourmaline

Gahnospinel and Polyhalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Gahnospinel and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gahnospinel and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Gahnospinel is 2.78 whereas that of Polyhalite is 2.78.