Realgar and Spinel Physical Properties

Realgar

Spinel

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

none

1.3 Durability

Not Available

1.4 Specific Gravity

3.563.64-3.66

1 7.18

1.5 Fracture

(e.g. graphite).

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

{010} Good

None, but may exhibit slight parting

1.7 Mohs Hardness

Not Available8

2 10

1.8 Chemical Composition

AsSMichael OâDonoghue , Gems, Sixth Edition (2006)

MgAl₂O₄

Realgar and Spinel Chemical Formula

While comparing Realgar and Spinel 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 Spinel chemical formula.

Chemical formula of Realgar- AsSMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Spinel- MgAl₂O₄

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Realgar and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Realgar and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Realgar and Spinel Optical Properties during the identification of gemstone. Specific gravity of Realgar is 3.64-3.66 whereas that of Spinel is 3.64-3.66.