Sillimanite and Hiddenite Physical Properties

Sillimanite

Hiddenite

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.263.15-3.21

1 7.18

1.5 Fracture

Splintery

Gemstones of the world (2001), UnevenWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

{010} perfect

1,2 prismatic

1.7 Mohs Hardness

6-7.56-7

2 10

1.8 Chemical Composition

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

LiAlSi₂O₆

Sillimanite and Hiddenite Chemical Formula

While comparing Sillimanite and Hiddenite 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 Hiddenite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Hiddenite- LiAlSi₂O₆

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Sillimanite and Hiddenite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Hiddenite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Hiddenite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.15-3.21 whereas that of Hiddenite is 3.15-3.21.