Achroite and Apatite Physical Properties
Specific Gravity
2.90-3.40
3.16-3.23
Fracture
Uneven, ConchoidalWalter Schumann
Conchoidal, Uneven, Conchoidal to uneven
Cleavage
Indiscernible
[0001] indistinct, [1010] indistinct
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.
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references
Achroite and Apatite Chemical Formula
While comparing Achroite and Apatite 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 Apatite 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 Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references
Achroite and Apatite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Achroite and Apatite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Apatite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 3.16-3.23 whereas that of Apatite is 3.16-3.23.