Sillimanite and Dioptase Physical Properties

Sillimanite

Dioptase

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.263.25-3.35

1 7.18

1.5 Fracture

Splintery

Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle

1.6 Cleavage

{010} perfect

Perfect in three directions

1.7 Mohs Hardness

6-7.55

2 10

1.8 Chemical Composition

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Sillimanite and Dioptase Chemical Formula

While comparing Sillimanite and Dioptase 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 Sillimanite and Dioptase chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Dioptase- CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Sillimanite Vs Starlite

Sillimanite and Dioptase Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Dioptase Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Dioptase Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.25-3.35 whereas that of Dioptase is 3.25-3.35.