Achroite and Cinnabar Physical Properties

Achroite

Cinnabar

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Physical Properties

Tenacity

Slightly sectile

Solubility

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

Durability

Specific Gravity

2.90-3.402

1 7.18

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Fracture

Uneven, ConchoidalWalter Schumann

Uneven

Cleavage

Indiscernible

Prismatic {10 1 0}, perfect

Mohs Hardness

7-7.52-2.5

2 10

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Chemical Composition

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

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

Achroite and Cinnabar Chemical Formula

While comparing Achroite 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 Achroite and Cinnabar chemical formula.

Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.
Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Achroite and Cinnabar Specific Gravity

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