Corundum and Howlite Physical Properties

Corundum

Howlite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.90-4.052.45-2.58

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Difficult, Fibrous

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

1.6 Cleavage

None – parting in 3 directions

None

1.7 Mohs Hardness

93-3.5

2 10

1.8 Chemical Composition

Al 2O 3Arthur Thomas , Gemstones (2009)

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

Corundum and Howlite Chemical Formula

While comparing Corundum 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 Corundum and Howlite chemical formula.

Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Corundum and Howlite Specific Gravity

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