Spinel and Achroite Physical Properties
Tenacity
Not Available
Not Available
Solubility
none
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.64-3.66
2.90-3.40
Fracture
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Cleavage
None, but may exhibit slight parting
Not Available
Chemical Composition
MgAl2O4
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.
Spinel and Achroite Chemical Formula
While comparing Spinel and Achroite 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 Spinel and Achroite chemical formula.
- Chemical formula of Spinel- MgAl2O4
- Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.
Spinel and Achroite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Spinel and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Spinel and Achroite Optical Properties during the identification of gemstone. Specific gravity of Spinel is 2.90-3.40 whereas that of Achroite is 2.90-3.40.