Dumortierite and Andradite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.26-3.41
3.70-4.10
Fracture
Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Cleavage
Distinct on {100}, poor on {110}; parting on {001}
none
Mohs Hardness
7-8.5
6.5-7
Chemical Composition
AlAl6O3BSi3O18
Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Dumortierite and Andradite Chemical Formula
While comparing Dumortierite and Andradite 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 Dumortierite and Andradite chemical formula.
- Chemical formula of Dumortierite- AlAl6O3BSi3O18
- Chemical formula of Andradite- Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Dumortierite and Andradite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Dumortierite and Andradite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dumortierite and Andradite Optical Properties during the identification of gemstone. Specific gravity of Dumortierite is 3.70-4.10 whereas that of Andradite is 3.70-4.10.