Amethyst and Cinnabar Physical Properties

Amethyst

Cinnabar

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Physical Properties

Tenacity

Slightly sectile

Solubility

insoluble in common solvents

1.04 x 10⁻²⁵ g per 100 ml water (Ksp at 25°C = 2 x 10⁻³²)

Durability

Specific Gravity

2.652

1 7.18

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Fracture

Conchoidal, ConchoidalWalter Schumann

Uneven

Cleavage

Indiscernible

Prismatic {10 1 0}, perfect

Mohs Hardness

72-2.5

2 10

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Chemical Composition

SiO₂

HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Amethyst and Cinnabar Chemical Formula

While comparing Amethyst and Cinnabar 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 Cinnabar chemical formula.

Chemical formula of Amethyst- SiO₂
Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Amethyst and Cinnabar Specific Gravity

Another important criteria for qualitative analysis of gemstones is Amethyst and Cinnabar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Amethyst and Cinnabar Optical Properties during the identification of gemstone. Specific gravity of Amethyst is 2 whereas that of Cinnabar is 2.