Amethyst and Gibbsite Physical Properties

Amethyst

Gibbsite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

insoluble in common solvents

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.652.35

1 7.18

1.5 Fracture

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

Fibrous, Difficult, Fibrous

1.6 Cleavage

Indiscernible

{001} Perfect

1.7 Mohs Hardness

72.5-3

2 10

1.8 Chemical Composition

SiO₂

Al(OH)3

Amethyst and Gibbsite Chemical Formula

While comparing Amethyst and Gibbsite 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 Amethyst and Gibbsite chemical formula.

Chemical formula of Amethyst- SiO₂
Chemical formula of Gibbsite- Al(OH)3

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Amethyst and Gibbsite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Amethyst and Gibbsite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Amethyst and Gibbsite Optical Properties during the identification of gemstone. Specific gravity of Amethyst is 2.35 whereas that of Gibbsite is 2.35.