Riebeckite and Cinnabar Physical Properties

Riebeckite

Cinnabar

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Physical Properties

Tenacity

Brittle

Slightly sectile

Solubility

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

Durability

Specific Gravity

3.28-3.442

1 7.18

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Fracture

Uneven, Splintery

Uneven

Cleavage

Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}

Prismatic {10 1 0}, perfect

Mohs Hardness

5.0-6.02-2.5

2 10

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Chemical Composition

Na2Fe2+3Fe3+2Si8O22(OH)2

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

Riebeckite and Cinnabar Chemical Formula

While comparing Riebeckite 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 Riebeckite and Cinnabar chemical formula.

Chemical formula of Riebeckite- Na2Fe2+3Fe3+2Si8O22(OH)2
Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Riebeckite and Cinnabar Specific Gravity

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