Polyhalite and Spinel Physical Properties

Polyhalite

Spinel

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

none

1.3 Durability

Not Available

1.4 Specific Gravity

2.783.64-3.66

1 7.18

1.5 Fracture

Conchoidal, Brittle

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

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

None, but may exhibit slight parting

1.7 Mohs Hardness

3.58

2 10

1.8 Chemical Composition

Not Available

MgAl₂O₄

Polyhalite and Spinel Chemical Formula

While comparing Polyhalite and Spinel 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 Polyhalite and Spinel chemical formula.

Chemical formula of Spinel- MgAl₂O₄

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Polyhalite and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.