Astrophyllite and Cinnabar Physical Properties

Astrophyllite

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

3.2-3.42

1 7.18

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Fracture

Uneven

Cleavage

Perfect on [001] imperfect on [100]

Prismatic {10 1 0}, perfect

Mohs Hardness

32-2.5

2 10

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Chemical Composition

(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

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

Astrophyllite and Cinnabar Chemical Formula

While comparing Astrophyllite 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 Astrophyllite and Cinnabar chemical formula.

Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Astrophyllite and Cinnabar Specific Gravity

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