Corundum and Diaspore Physical Properties

Corundum

Diaspore

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1 Physical Properties

1.1 Tenacity

Brittle

Very brittle

1.2 Solubility

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.90-4.053.30-3.40

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Difficult, Fibrous

Conchoidal, Brittle, Conchoidal

1.6 Cleavage

None – parting in 3 directions

{010} perfect, {110} distinct, {100} in traces

1.7 Mohs Hardness

96.5-7

2 10

1.8 Chemical Composition

Al 2O 3Arthur Thomas , Gemstones (2009)

AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references

Corundum and Diaspore Chemical Formula

While comparing Corundum and Diaspore 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 Diaspore chemical formula.

Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Diaspore- AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references

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Corundum and Diaspore Specific Gravity

Another important criteria for qualitative analysis of gemstones is Corundum and Diaspore Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Diaspore Optical Properties during the identification of gemstone. Specific gravity of Corundum is 3.30-3.40 whereas that of Diaspore is 3.30-3.40.