Alexandrite and Gypsum Physical Properties

Alexandrite

Gypsum

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1 Physical Properties

1.1 Tenacity

Not Available

Flexible

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.69-3.812.20-2.40

1 7.18

1.5 Fracture

Not Available

Conchoidal, Splintery, Fibrous, UnevenArthur Thomas, Gemstones (2009)

1.6 Cleavage

1,1 ; 3,2.

Perfect on {010}, distinct on {100}

1.7 Mohs Hardness

8.52

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)

Alexandrite and Gypsum Chemical Formula

While comparing Alexandrite and Gypsum 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 Alexandrite and Gypsum chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Gypsum- CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)

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Alexandrite and Gypsum Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Gypsum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Gypsum Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 2.20-2.40 whereas that of Gypsum is 2.20-2.40.