Corundum and Tourmaline Physical Properties

Corundum

Tourmaline

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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

3.90-4.052.85-3.35

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Difficult, Fibrous

Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

None – parting in 3 directions

Indistinct

1.7 Mohs Hardness

97-7.5

2 10

1.8 Chemical Composition

Al 2O 3Arthur Thomas , Gemstones (2009)

Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.

Corundum and Tourmaline Chemical Formula

While comparing Corundum and Tourmaline 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 Tourmaline chemical formula.

Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Tourmaline- Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.

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Corundum and Tourmaline Specific Gravity

Another important criteria for qualitative analysis of gemstones is Corundum and Tourmaline Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Tourmaline Optical Properties during the identification of gemstone. Specific gravity of Corundum is 2.85-3.35 whereas that of Tourmaline is 2.85-3.35.