Polyhalite and Alexandrite Physical Properties

Polyhalite

Alexandrite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.783.69-3.81

1 7.18

1.5 Fracture

Conchoidal, Brittle

Not Available

1.6 Cleavage

Perfect on {10 1 }; parting on {010}

1,1 ; 3,2.

1.7 Mohs Hardness

3.58.5

2 10

1.8 Chemical Composition

Not Available

BeAl ₂ O ₄

Polyhalite and Alexandrite Chemical Formula

While comparing Polyhalite and Alexandrite 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 Polyhalite and Alexandrite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄

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Polyhalite and Alexandrite Specific Gravity

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