Achroite and Sphalerite Physical Properties
Specific Gravity
2.90-3.40
3.95-4.10
Fracture
Uneven, ConchoidalWalter Schumann
Uneven
Cleavage
Indiscernible
{110} Perfect, {110} Perfect, {110} Perfect
Mohs Hardness
7-7.5
3.5-4
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.
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Achroite and Sphalerite Chemical Formula
While comparing Achroite and Sphalerite 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 Sphalerite 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 Sphalerite- (Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Achroite and Sphalerite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Achroite and Sphalerite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Sphalerite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 3.95-4.10 whereas that of Sphalerite is 3.95-4.10.