Sillimanite and Howlite Physical Properties

Sillimanite

Howlite

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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

3.20-3.262.45-2.58

1 7.18

1.5 Fracture

Splintery

UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal

1.6 Cleavage

{010} perfect

None

1.7 Mohs Hardness

6-7.53-3.5

2 10

1.8 Chemical Composition

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

Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Sillimanite and Howlite Chemical Formula

While comparing Sillimanite and Howlite 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 Howlite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Sillimanite and Howlite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Howlite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Howlite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.45-2.58 whereas that of Howlite is 2.45-2.58.