Achroite and Onyx Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.90-3.40
2.55-2.70
Fracture
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Not Available
Cleavage
Not Available
Indiscernible
Mohs Hardness
7-7.5
6.5-7
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.
SiO2
Achroite and Onyx Chemical Formula
While comparing Achroite and Onyx 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 Onyx 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 Onyx- SiO2
Achroite and Onyx Specific Gravity
Another important criteria for qualitative analysis of gemstones is Achroite and Onyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Onyx Optical Properties during the identification of gemstone. Specific gravity of Achroite is 2.55-2.70 whereas that of Onyx is 2.55-2.70.