Achroite and Bertrandite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.90-3.40
2.59-2.60
Fracture
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Brittle, Metallic, Brittle, Metallic
Cleavage
Not Available
{001} Perfect, {110} Distinct, {101} Distinct
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.
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
Achroite and Bertrandite Chemical Formula
While comparing Achroite and Bertrandite 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 Bertrandite 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 Bertrandite- Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
Achroite and Bertrandite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Achroite and Bertrandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Bertrandite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 2.59-2.60 whereas that of Bertrandite is 2.59-2.60.