Erythrite and Common Opal Physical Properties

Erythrite

Common Opal

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1 Physical Properties

1.1 Tenacity

Sectile

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.061.98-2.50

1 7.18

1.5 Fracture

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

Conchoidal, Conchoidal, Gemstones of the world (2001)

1.6 Cleavage

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

Not Available

1.7 Mohs Hardness

Not Available5.5-6.5

2 10

1.8 Chemical Composition

Co3(AsO4)2•8(H2O)

SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Erythrite and Common Opal Chemical Formula

While comparing Erythrite and Common Opal 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 Common Opal chemical formula.

Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)
Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

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Erythrite and Common Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Erythrite and Common Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Erythrite and Common Opal Optical Properties during the identification of gemstone. Specific gravity of Erythrite is 1.98-2.50 whereas that of Common Opal is 1.98-2.50.