Pyromorphite and Cinnabar Physical Properties

Pyromorphite

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

6.5-7.12

1 7.18

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Fracture

Uneven, Conchoidal

Uneven

Cleavage

Imperfect- [10 1 1]

Prismatic {10 1 0}, perfect

Mohs Hardness

3.5-42-2.5

2 10

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Chemical Composition

Pb 5(PO 4) 3ClArthur Thomas , Gemstones (2009)

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

Pyromorphite and Cinnabar Chemical Formula

While comparing Pyromorphite 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 Pyromorphite and Cinnabar chemical formula.

Chemical formula of Pyromorphite- Pb 5(PO 4) 3ClArthur Thomas , Gemstones (2009)
Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Pyromorphite and Cinnabar Specific Gravity

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