Gibbsite and Amethyst Physical Properties

Gibbsite

Amethyst

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

insoluble in common solvents

1.3 Durability

Not Available

1.4 Specific Gravity

2.352.65

1 7.18

1.5 Fracture

Fibrous, Difficult, Fibrous

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

1.6 Cleavage

{001} Perfect

Indiscernible

1.7 Mohs Hardness

2.5-37

2 10

1.8 Chemical Composition

Al(OH)3

SiO₂

Gibbsite and Amethyst Chemical Formula

While comparing Gibbsite 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 Gibbsite and Amethyst chemical formula.

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

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Gibbsite and Amethyst Specific Gravity

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