Riebeckite and Almandine Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.28-3.44
  
3.95-4.30
  
Fracture
Uneven, Splintery, Brittle
  
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
  
Cleavage
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
  
none
  
Mohs Hardness
5.0-6.0
  
7-7.5
  
Chemical Composition
Not Available
  
Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
  
Riebeckite and Almandine Chemical Formula
While comparing Riebeckite and Almandine 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 Almandine chemical formula.
>- Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Riebeckite and Almandine Specific Gravity
Another important criteria for qualitative analysis of gemstones is Riebeckite and Almandine Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Riebeckite and Almandine Optical Properties during the identification of gemstone. Specific gravity of Riebeckite is 3.95-4.30 whereas that of Almandine is 3.95-4.30.