Sillimanite and Edenite Physical Properties

Sillimanite

Edenite

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.263.05-3.37

1 7.18

1.5 Fracture

Splintery

Conchoidal, Brittle, Conchoidal

1.6 Cleavage

{010} perfect

Good on (110)

1.7 Mohs Hardness

6-7.55-6

2 10

1.8 Chemical Composition

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

NaCa2Mg5Si7AlO22(OH)2

Sillimanite and Edenite Chemical Formula

While comparing Sillimanite and Edenite 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 Edenite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Edenite- NaCa2Mg5Si7AlO22(OH)2

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Sillimanite and Edenite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Edenite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Edenite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.05-3.37 whereas that of Edenite is 3.05-3.37.