Cinnabar and Amethyst Physical Properties

Cinnabar

Amethyst

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1 Physical Properties

1.1 Tenacity

Slightly sectile

Not Available

1.2 Solubility

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

insoluble in common solvents

1.3 Durability

Not Available

1.4 Specific Gravity

22.65

1 7.18

1.5 Fracture

Uneven, Uneven, Gemstones (2009), Brittle

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

1.6 Cleavage

Prismatic {10 1 0}, perfect

Indiscernible

1.7 Mohs Hardness

2-2.57

2 10

1.8 Chemical Composition

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

SiO₂

Cinnabar and Amethyst Chemical Formula

While comparing Cinnabar 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 Cinnabar and Amethyst chemical formula.

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

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Cinnabar and Amethyst Specific Gravity

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