Erythrite and Crystal Opal Physical Properties

Erythrite

Crystal 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

3.06

1.97-2.22

1.5 Fracture

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

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

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

Not Available

1.7 Mohs Hardness

Not Available

5.5-6.5

1.8 Chemical Composition

Co3(AsO4)2•8(H2O)

SiO 2 + H 2OUlrich Henn and Claudio C.

Erythrite and Crystal Opal Chemical Formula

While comparing Erythrite and Crystal 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 Crystal Opal chemical formula.

Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)
Chemical formula of Crystal Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

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Erythrite and Crystal Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Erythrite and Crystal Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Erythrite and Crystal Opal Optical Properties during the identification of gemstone. Specific gravity of Erythrite is 1.97-2.22 whereas that of Crystal Opal is 1.97-2.22.