Stolzite and Sillimanite Physical Properties

Stolzite

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

23.20-3.26

1 7.18

1.5 Fracture

Conchoidal, Uneven, Brittle

Splintery

1.6 Cleavage

Imperfect on {001}, indistinct on {011}

{010} perfect

1.7 Mohs Hardness

2.5-36-7.5

2 10

1.8 Chemical Composition

Not Available

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

Stolzite and Sillimanite Chemical Formula

While comparing Stolzite 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 Stolzite and Sillimanite chemical formula.

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

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Stolzite and Sillimanite Specific Gravity

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