Riebeckite and Amethyst Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
insoluble in common solvents
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.28-3.44
  
2.65
  
Fracture
Uneven, Splintery, Brittle
  
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
  
Cleavage
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
  
Indiscernible
  
Mohs Hardness
5.0-6.0
  
7
  
Chemical Composition
Not Available
  
SiO2
  
Riebeckite and Amethyst Chemical Formula
While comparing Riebeckite and Amethyst 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 Riebeckite and Amethyst chemical formula.
>- Chemical formula of Amethyst- SiO2
Riebeckite and Amethyst Specific Gravity
Another important criteria for qualitative analysis of gemstones is Riebeckite and Amethyst Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Riebeckite and Amethyst Optical Properties during the identification of gemstone. Specific gravity of Riebeckite is 2.65 whereas that of Amethyst is 2.65.