Grandidierite and Polyhalite Physical Properties

Grandidierite

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

2.85-3.002.78

1 7.18

1.5 Fracture

Brittle, UnevenArthur Thomas, Gemstones (2009), Brittle, Uneven

Conchoidal, Brittle

1.6 Cleavage

Perfect

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

1.7 Mohs Hardness

7.53.5

2 10

1.8 Chemical Composition

(Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.

Not Available

Grandidierite and Polyhalite Chemical Formula

While comparing Grandidierite 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 Grandidierite and Polyhalite chemical formula.

Chemical formula of Grandidierite- (Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.

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Grandidierite and Polyhalite Specific Gravity

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