Almandine and Onyx Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.95-4.30
  
2.55-2.70
  
Fracture
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
  
Not Available
  
Cleavage
none
  
Indiscernible
  
Mohs Hardness
7-7.5
  
6.5-7
  
Chemical Composition
Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
  
SiO2
  
Almandine and Onyx Chemical Formula
While comparing Almandine and Onyx 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 Almandine and Onyx chemical formula.
- Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
- Chemical formula of Onyx- SiO2
Almandine and Onyx Specific Gravity
Another important criteria for qualitative analysis of gemstones is Almandine and Onyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Almandine and Onyx Optical Properties during the identification of gemstone. Specific gravity of Almandine is 2.55-2.70 whereas that of Onyx is 2.55-2.70.