Alunite and Cinnabar Physical Properties

Alunite

Cinnabar

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1 Physical Properties

1.1 Tenacity

Brittle

Slightly sectile

1.2 Solubility

Soluble

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

2.6-2.92

1 7.18

1.5 Fracture

Conchoidal, Uneven

Uneven, Uneven, Gemstones (2009), Brittle

1.6 Cleavage

On {0001}, perfect

Prismatic {10 1 0}, perfect

1.7 Mohs Hardness

3.5-42-2.5

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

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

Alunite and Cinnabar Chemical Formula

While comparing Alunite 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 Alunite and Cinnabar chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Alunite and Cinnabar Specific Gravity

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