Bastnasite and Sillimanite Physical Properties

Bastnasite

Sillimanite

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Physical Properties

Tenacity

Tough

Solubility

Durability

Specific Gravity

4.95-5.03.20-3.26

1 7.18

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Fracture

Uneven

Splintery

Cleavage

Imperfect to indistinct on {10 1 0}, parting on {0001}

{010} perfect

Mohs Hardness

4-56-7.5

2 10

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Chemical Composition

(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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

Bastnasite and Sillimanite Chemical Formula

While comparing Bastnasite 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 Bastnasite and Sillimanite chemical formula.

Chemical formula of Bastnasite- (Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Bastnasite and Sillimanite Specific Gravity

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