Datolite and Polyhalite Physical Properties

Datolite

Polyhalite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.90-3.002.78

1 7.18

1.5 Fracture

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Metallic

Conchoidal, Brittle

1.6 Cleavage

None

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

1.7 Mohs Hardness

5-5.53.5

2 10

1.8 Chemical Composition

CaBSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Not Available

Datolite and Polyhalite Chemical Formula

While comparing Datolite 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 Datolite and Polyhalite chemical formula.

Chemical formula of Datolite- CaBSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Datolite and Polyhalite Specific Gravity

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