Gibbsite and Achroite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.35
2.90-3.40
Fracture
Fibrous, Difficult, Fibrous
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Cleavage
{001} Perfect
Not Available
Mohs Hardness
2.5-3
7-7.5
Chemical Composition
Al(OH)3
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.
Gibbsite and Achroite Chemical Formula
While comparing Gibbsite 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 Gibbsite and Achroite chemical formula.
- Chemical formula of Gibbsite- Al(OH)3
- 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.
Gibbsite and Achroite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Gibbsite and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gibbsite and Achroite Optical Properties during the identification of gemstone. Specific gravity of Gibbsite is 2.90-3.40 whereas that of Achroite is 2.90-3.40.