Achroite and Chrysoberyl Physical Properties

Achroite

Chrysoberyl

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

2.90-3.403.69-3.81

1 7.18

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Fracture

Uneven, ConchoidalWalter Schumann

Uneven, Conchoidal to uneven, ConchoidalWalter Schumann

Cleavage

Indiscernible

Distinct on {110}, imperfect on {010}, poor on {001}

Mohs Hardness

7-7.58.5

2 10

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Chemical Composition

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.

BeAl ₂ O ₄

Achroite and Chrysoberyl Chemical Formula

While comparing Achroite and Chrysoberyl 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 Achroite and Chrysoberyl chemical formula.

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.
Chemical formula of Chrysoberyl- BeAl ₂ O ₄

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Achroite and Chrysoberyl Specific Gravity

Another important criteria for qualitative analysis of gemstones is Achroite and Chrysoberyl Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Chrysoberyl Optical Properties during the identification of gemstone. Specific gravity of Achroite is 3.69-3.81 whereas that of Chrysoberyl is 3.69-3.81.