Sillimanite and Spodumene Physical Properties

Sillimanite

Spodumene

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.263.15-3.21

1 7.18

1.5 Fracture

Splintery

Uneven, Subconchoidal, Gemstones (2009)

1.6 Cleavage

{010} perfect

Perfect prismatic, two directions {110} ∧ {1 1 0} at 87°

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 Spodumene Chemical Formula

While comparing Sillimanite and Spodumene 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 Spodumene chemical formula.

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

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Sillimanite and Spodumene Specific Gravity

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