Common Opal and Anhydrite Physical Properties

Common Opal

Anhydrite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.98-2.502.90-2.98

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones of the world (2001)

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

1.6 Cleavage

Not Available

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

1.7 Mohs Hardness

5.5-6.53.5

2 10

1.8 Chemical Composition

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

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

Common Opal and Anhydrite Chemical Formula

While comparing Common Opal 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 Common Opal and Anhydrite chemical formula.

Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Chemical formula of Anhydrite- CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Compare Blue Gemstones

Common Opal Vs Dravite

Common Opal Vs Dumortierite

Common Opal Vs Diamond

Common Opal and Anhydrite Specific Gravity

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