Onyx and Faustite Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.55-2.70
  
2.9
  
Fracture
Not Available
  
Conchoidal, ConchoidalAnthony et al, Conchoidal, Brittle, Conchoidal
  
Cleavage
Indiscernible
  
{???} Indistinct
  
Mohs Hardness
6.5-7
  
4.5
  
Chemical Composition
SiO2
  
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
  
Onyx and Faustite Chemical Formula
While comparing Onyx and Faustite 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 Onyx and Faustite chemical formula.
- Chemical formula of Onyx- SiO2
- Chemical formula of Faustite- (Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Onyx and Faustite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Onyx and Faustite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Faustite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.9 whereas that of Faustite is 2.9.