Kyanite and Amethyst Physical Properties

Kyanite

Amethyst

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

insoluble in common solvents

1.3 Durability

Not Available

1.4 Specific Gravity

3.53-3.652.65

1 7.18

1.5 Fracture

Splintery, Brittle, Metallic

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

1.6 Cleavage

[100] perfect [010] imperfect with 79° angle between

Indiscernible

1.7 Mohs Hardness

4-77

2 10

1.8 Chemical Composition

Not Available

SiO₂

Kyanite and Amethyst Chemical Formula

While comparing Kyanite 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 Kyanite and Amethyst chemical formula.

Chemical formula of Amethyst- SiO₂

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Kyanite and Amethyst Specific Gravity

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