Sillimanite and Hollandite Physical Properties

Sillimanite

Hollandite

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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

3.20-3.265.05

1 7.18

1.5 Fracture

Splintery

Brittle, Metallic

1.6 Cleavage

{010} perfect

Distinct / Good, Prismatic

1.7 Mohs Hardness

6-7.54-6

2 10

1.8 Chemical Composition

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

Ba(Mn++++,Mn++)8O16

Sillimanite and Hollandite Chemical Formula

While comparing Sillimanite and Hollandite 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 Hollandite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Hollandite- Ba(Mn++++,Mn++)8O16

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Sillimanite and Hollandite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Hollandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Hollandite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 5.05 whereas that of Hollandite is 5.05.