Sillimanite and Marialite Physical Properties

Sillimanite

Marialite

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.262.50

1 7.18

1.5 Fracture

Splintery

Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal

1.6 Cleavage

{010} perfect

Distinct on {100} and {110}

1.7 Mohs Hardness

6-7.55.5-6

2 10

1.8 Chemical Composition

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

3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)

Sillimanite and Marialite Chemical Formula

While comparing Sillimanite and Marialite 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 Marialite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Marialite- 3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)

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Sillimanite and Marialite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Marialite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Marialite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.50 whereas that of Marialite is 2.50.