Rubellite and Purpurite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.01-3.06
3.2-3.4
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven, UnevenArthur Thomas, Gemstones (2009), Brittle
Cleavage
Not Available
[100] [001] perfect
Mohs Hardness
7-7.5
4-4.5
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.
MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references
Rubellite and Purpurite Chemical Formula
While comparing Rubellite and Purpurite 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 Rubellite and Purpurite chemical formula.
- Chemical formula of Rubellite- 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 Purpurite- MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references
Rubellite and Purpurite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Rubellite and Purpurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Rubellite and Purpurite Optical Properties during the identification of gemstone. Specific gravity of Rubellite is 3.2-3.4 whereas that of Purpurite is 3.2-3.4.