Gyrolite and Sillimanite Physical Properties

Gyrolite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.483.20-3.26

1 7.18

1.5 Fracture

Brittle, Uneven, Brittle, Uneven

Splintery

1.6 Cleavage

Perfect on {001}

{010} perfect

1.7 Mohs Hardness

26-7.5

2 10

1.8 Chemical Composition

NaCa16Si23AlO60(OH)8•64(H2O)

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

Gyrolite and Sillimanite Chemical Formula

While comparing Gyrolite 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 Gyrolite and Sillimanite chemical formula.

Chemical formula of Gyrolite- NaCa16Si23AlO60(OH)8•64(H2O)
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Gyrolite and Sillimanite Specific Gravity

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