Elbaite and Sillimanite Physical Properties

Elbaite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.90-3.103.20-3.26

1 7.18

1.5 Fracture

Uneven, Conchoidal, Brittle, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

Splintery

1.6 Cleavage

Poor/indistinct on {1120} and {1011}

{010} perfect

1.7 Mohs Hardness

76-7.5

2 10

1.8 Chemical Composition

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) More from other references

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

Elbaite and Sillimanite Chemical Formula

While comparing Elbaite and Sillimanite 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 Elbaite and Sillimanite chemical formula.

Chemical formula of Elbaite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) More from other references
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Elbaite and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Elbaite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Elbaite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Elbaite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.