Corundum and Franklinite Physical Properties

Corundum

Franklinite

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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

3.90-4.055.05-5.22

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Difficult, Fibrous

Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)

1.6 Cleavage

None – parting in 3 directions

None

1.7 Mohs Hardness

95.5-6

2 10

1.8 Chemical Composition

Al 2O 3Arthur Thomas , Gemstones (2009)

(Zn,Mn2+ ,Fe2+ )(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)

Corundum and Franklinite Chemical Formula

While comparing Corundum and Franklinite 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 Franklinite chemical formula.

Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Franklinite- (Zn,Mn2+ ,Fe2+ )(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)

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Corundum and Franklinite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Corundum and Franklinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Franklinite Optical Properties during the identification of gemstone. Specific gravity of Corundum is 5.05-5.22 whereas that of Franklinite is 5.05-5.22.