Spinel and Cinnabar Physical Properties

Spinel

Cinnabar

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1 Physical Properties

1.1 Tenacity

Not Available

Slightly sectile

1.2 Solubility

none

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

1.3 Durability

Not Available

1.4 Specific Gravity

3.64-3.662

1 7.18

1.5 Fracture

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

Uneven, Uneven, Gemstones (2009), Brittle

1.6 Cleavage

None, but may exhibit slight parting

Prismatic {10 1 0}, perfect

1.7 Mohs Hardness

82-2.5

2 10

1.8 Chemical Composition

MgAl₂O₄

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

Spinel and Cinnabar Chemical Formula

While comparing Spinel 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 Spinel and Cinnabar chemical formula.

Chemical formula of Spinel- MgAl₂O₄
Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Spinel and Cinnabar Specific Gravity

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