Andalusite and Cinnabar Physical Properties

Andalusite

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

3.05-3.212

1 7.18

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Fracture

Uneven, Subconchoidal, Splintery

Uneven

Cleavage

Good on {110}, poor on {100}

Prismatic {10 1 0}, perfect

Mohs Hardness

7.52-2.5

2 10

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Chemical Composition

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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

Andalusite and Cinnabar Chemical Formula

While comparing Andalusite 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 Andalusite and Cinnabar chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Compare Brown Gemstones

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Andalusite and Cinnabar Specific Gravity

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