Realgar and Opal Physical Properties

Realgar

Opal

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1 Physical Properties

1.1 Tenacity

Not Available

BrittleWalter Schumann

1.2 Solubility

Not Available

hot salt water

1.3 Durability

Not Available

1.4 Specific Gravity

3.561.98-2.25

1 7.18

1.5 Fracture

(e.g. graphite).

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle

1.6 Cleavage

{010} Good

None

1.7 Mohs Hardness

Not Available5-6.5

2 10

1.8 Chemical Composition

AsSMichael OâDonoghue , Gems, Sixth Edition (2006)

SiO₂ · nH₂O

Realgar and Opal Chemical Formula

While comparing Realgar and 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 Realgar and Opal chemical formula.

Chemical formula of Realgar- AsSMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Opal- SiO₂ · nH₂O

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Realgar and Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Realgar and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Realgar and Opal Optical Properties during the identification of gemstone. Specific gravity of Realgar is 1.98-2.25 whereas that of Opal is 1.98-2.25.