Achroite and Marcasite Physical Properties
Specific Gravity
2.90-3.40
4.80-4.90
Fracture
Uneven, ConchoidalWalter Schumann
Uneven
Cleavage
Indiscernible
{010} Indistinct
Mohs Hardness
7-7.5
6-6.5
Chemical Composition
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.
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Achroite and Marcasite Chemical Formula
While comparing Achroite and Marcasite 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 Achroite and Marcasite chemical formula.
- 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.
- Chemical formula of Marcasite- FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Achroite and Marcasite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Achroite and Marcasite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Marcasite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 4.80-4.90 whereas that of Marcasite is 4.80-4.90.