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Star Sapphire
Star Sapphire

Corundum
Corundum



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Star Sapphire
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Corundum

Star Sapphire and Corundum Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Brittle
1.2 Solubility
Not Available
insoluble
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.90-4.053.90-4.05
Amber
1 7.18
1.5 Fracture
Not Available
Uneven, Uneven, Gems, Difficult, Fibrous
1.6 Cleavage
Not Available
None – parting in 3 directions
1.7 Mohs Hardness
Not Available9
Amber
2 10
1.8 Chemical Composition
Al 2O 3Ulrich Henn and Claudio C.
Al 2O 3Arthur Thomas , Gemstones (2009)

Star Sapphire and Corundum Chemical Formula

While comparing Star Sapphire 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 Star Sapphire and Corundum chemical formula.

  • Chemical formula of Star Sapphire- Al 2O 3Ulrich Henn and Claudio C.
  • Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)

Star Sapphire and Corundum Specific Gravity

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