Polyhalite and Amethyst Physical Properties

Polyhalite

Amethyst

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

insoluble in common solvents

1.3 Durability

Not Available

1.4 Specific Gravity

2.782.65

1 7.18

1.5 Fracture

Conchoidal, Brittle

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

1.6 Cleavage

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

Indiscernible

1.7 Mohs Hardness

3.57

2 10

1.8 Chemical Composition

Not Available

SiO₂

Polyhalite and Amethyst Chemical Formula

While comparing Polyhalite and Amethyst 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 Amethyst chemical formula.

Chemical formula of Amethyst- SiO₂

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Polyhalite and Amethyst Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Amethyst Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Amethyst Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 2.65 whereas that of Amethyst is 2.65.