Thulite and Onyx Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.1
  
2.55-2.70
  
Fracture
Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)
  
Not Available
  
Cleavage
Perfect {010} imperfect {100}
  
Indiscernible
  
Mohs Hardness
6-7
  
6.5-7
  
Chemical Composition
Ca2Al3(SiO4)3(OH)
  
SiO2
  
Thulite and Onyx Chemical Formula
While comparing Thulite 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 Thulite and Onyx chemical formula.
- Chemical formula of Thulite- Ca2Al3(SiO4)3(OH)
- Chemical formula of Onyx- SiO2
Thulite and Onyx Specific Gravity
Another important criteria for qualitative analysis of gemstones is Thulite and Onyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Thulite and Onyx Optical Properties during the identification of gemstone. Specific gravity of Thulite is 2.55-2.70 whereas that of Onyx is 2.55-2.70.