Ruby and Achroite Physical Properties

Ruby

Achroite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.97-4.052.90-3.40

1 7.18

1.5 Fracture

Conchoidal

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

No true cleavage

Not Available

1.7 Mohs Hardness

97-7.5

2 10

1.8 Chemical Composition

Al ₂ O ₃

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

Ruby and Achroite Chemical Formula

While comparing Ruby and Achroite 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 Ruby and Achroite chemical formula.

Chemical formula of Ruby- Al ₂ O ₃
Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

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Ruby and Achroite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ruby and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ruby and Achroite Optical Properties during the identification of gemstone. Specific gravity of Ruby is 2.90-3.40 whereas that of Achroite is 2.90-3.40.