Achroite and Erythrite Physical Properties
Tenacity
Not Available
Sectile
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.90-3.40
3.06
Fracture
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Cleavage
Not Available
Perfect on {010}; poor on {100} and { 1 02}.
Mohs Hardness
7-7.5
Not Available
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.
Co3(AsO4)2•8(H2O)
Achroite and Erythrite Chemical Formula
While comparing Achroite and Erythrite 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 Erythrite 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 Erythrite- Co3(AsO4)2•8(H2O)
Achroite and Erythrite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Achroite and Erythrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Erythrite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 3.06 whereas that of Erythrite is 3.06.