Erythrite and Anhydrite Physical Properties

Erythrite

Anhydrite

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1 Physical Properties

1.1 Tenacity

Sectile

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.062.90-2.98

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

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

Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.

1.7 Mohs Hardness

Not Available3.5

2 10

1.8 Chemical Composition

Co3(AsO4)2•8(H2O)

CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Erythrite and Anhydrite Chemical Formula

While comparing Erythrite and Anhydrite 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 Erythrite and Anhydrite chemical formula.

Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)
Chemical formula of Anhydrite- CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Erythrite and Anhydrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Erythrite and Anhydrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Erythrite and Anhydrite Optical Properties during the identification of gemstone. Specific gravity of Erythrite is 2.90-2.98 whereas that of Anhydrite is 2.90-2.98.