Common Opal and Cinnabar Physical Properties

Common Opal

Cinnabar

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1 Physical Properties

1.1 Tenacity

Not Available

Slightly sectile

1.2 Solubility

Not Available

1.04 x 10⁻²⁵ g per 100 ml water (Ksp at 25°C = 2 x 10⁻³²)

1.3 Durability

Not Available

1.4 Specific Gravity

1.98-2.502

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones of the world (2001)

Uneven, Uneven, Gemstones (2009), Brittle

1.6 Cleavage

Not Available

Prismatic {10 1 0}, perfect

1.7 Mohs Hardness

5.5-6.52-2.5

2 10

1.8 Chemical Composition

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

HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Common Opal and Cinnabar Chemical Formula

While comparing Common Opal and Cinnabar 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 Cinnabar chemical formula.

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

Compare Blue Gemstones

Common Opal Vs Dumortierite

Common Opal Vs Diamond

Common Opal Vs Dravite

Common Opal and Cinnabar Specific Gravity

Another important criteria for qualitative analysis of gemstones is Common Opal and Cinnabar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Common Opal and Cinnabar Optical Properties during the identification of gemstone. Specific gravity of Common Opal is 2 whereas that of Cinnabar is 2.