Galena and Achroite Physical Properties
Physical Properties
Tenacity
Brittle
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
6.23
2.90-3.40
Fracture
Subconchoidal, Brittle, Metallic
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Cleavage
Cubic perfect on [001], parting on [111]
Not Available
Mohs Hardness
2.5-2.75
7-7.5
Chemical Composition
PbS
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.
Galena and Achroite Chemical Formula
While comparing Galena 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 Galena and Achroite chemical formula.
- Chemical formula of Galena- PbS
- 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.
Galena and Achroite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Galena and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Galena and Achroite Optical Properties during the identification of gemstone. Specific gravity of Galena is 2.90-3.40 whereas that of Achroite is 2.90-3.40.
