Amethyst and Atacamite Physical Properties

Amethyst

Atacamite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

insoluble in common solvents

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.653.745-3.776

1 7.18

1.5 Fracture

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

Conchoidal, Conchoidal, Brittle

1.6 Cleavage

Indiscernible

Perfect on {010}, fair on {101}

1.7 Mohs Hardness

73-3.5

2 10

1.8 Chemical Composition

SiO₂

Cu2Cl(OH)3

Amethyst and Atacamite Chemical Formula

While comparing Amethyst and Atacamite 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 Atacamite chemical formula.

Chemical formula of Amethyst- SiO₂
Chemical formula of Atacamite- Cu2Cl(OH)3

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Amethyst and Atacamite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Amethyst and Atacamite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Amethyst and Atacamite Optical Properties during the identification of gemstone. Specific gravity of Amethyst is 3.745-3.776 whereas that of Atacamite is 3.745-3.776.