Franklinite and Corundum Physical Properties

Franklinite

Corundum

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

5.05-5.223.90-4.05

1 7.18

1.5 Fracture

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

Uneven, Uneven, Gems, Difficult, Fibrous

1.6 Cleavage

None

None – parting in 3 directions

1.7 Mohs Hardness

5.5-69

2 10

1.8 Chemical Composition

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

Al 2O 3Arthur Thomas , Gemstones (2009)

Franklinite and Corundum Chemical Formula

While comparing Franklinite and Corundum 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 Franklinite and Corundum chemical formula.

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

Compare Red Gemstones

Franklinite Vs Hibonite

Franklinite Vs Hexagonite

Franklinite Vs Hydrogrossular

Franklinite and Corundum Specific Gravity

Another important criteria for qualitative analysis of gemstones is Franklinite and Corundum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Franklinite and Corundum Optical Properties during the identification of gemstone. Specific gravity of Franklinite is 3.90-4.05 whereas that of Corundum is 3.90-4.05.