Polyhalite and Erythrite Physical Properties

Polyhalite

Erythrite

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1 Physical Properties

1.1 Tenacity

Brittle

Sectile

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.78

3.06

1.5 Fracture

Conchoidal, Brittle

Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

1.6 Cleavage

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

Perfect on {010}; poor on {100} and { 1 02}.

1.7 Mohs Hardness

3.5

Not Available

1.8 Chemical Composition

Not Available

Co3(AsO4)2•8(H2O)

Polyhalite and Erythrite Chemical Formula

While comparing Polyhalite and Erythrite 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 Erythrite chemical formula.

Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)

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Polyhalite and Erythrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Erythrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Erythrite Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 3.06 whereas that of Erythrite is 3.06.