Polyhalite and Grandidierite Physical Properties

Polyhalite

Grandidierite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.782.85-3.00

1 7.18

1.5 Fracture

Conchoidal, Brittle

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

1.6 Cleavage

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

Perfect

1.7 Mohs Hardness

3.57.5

2 10

1.8 Chemical Composition

Not Available

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

Polyhalite and Grandidierite Chemical Formula

While comparing Polyhalite and Grandidierite 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 Grandidierite chemical formula.

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

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Polyhalite and Grandidierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Grandidierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Grandidierite Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 2.85-3.00 whereas that of Grandidierite is 2.85-3.00.