Realgar and Topaz Physical Properties

Realgar

Topaz

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.563.49-3.57

1 7.18

1.5 Fracture

(e.g. graphite).

Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

{010} Good

[001] Perfect

1.7 Mohs Hardness

Not Available8

2 10

1.8 Chemical Composition

AsSMichael OâDonoghue , Gems, Sixth Edition (2006)

Al₂SiO₄(F,OH)₂

Realgar and Topaz Chemical Formula

While comparing Realgar and Topaz 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 Topaz chemical formula.

Chemical formula of Realgar- AsSMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Topaz- Al₂SiO₄(F,OH)₂

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Realgar and Topaz Specific Gravity

Another important criteria for qualitative analysis of gemstones is Realgar and Topaz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Realgar and Topaz Optical Properties during the identification of gemstone. Specific gravity of Realgar is 3.49-3.57 whereas that of Topaz is 3.49-3.57.