Dolomite and Common Opal Physical Properties

Dolomite

Common Opal

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Poorly soluble in dilute HCl

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.80-2.951.98-2.50

1 7.18

1.5 Fracture

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

Conchoidal, Conchoidal, Gemstones of the world (2001)

1.6 Cleavage

Perfect on {10 1 1}, rhombohedral cleavage

Not Available

1.7 Mohs Hardness

3.5-45.5-6.5

2 10

1.8 Chemical Composition

CaMg(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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

Dolomite and Common Opal Chemical Formula

While comparing Dolomite 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 Dolomite and Common Opal chemical formula.

Chemical formula of Dolomite- CaMg(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

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Dolomite and Common Opal Specific Gravity

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