Onyx and Apatite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.55-2.70
3.16-3.23
Fracture
Not Available
Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal to uneven
Cleavage
Indiscernible
[0001] indistinct, [1010] indistinct
Chemical Composition
SiO2
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references
Onyx and Apatite Chemical Formula
While comparing Onyx and Apatite 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 Apatite chemical formula.
- Chemical formula of Onyx- SiO2
- Chemical formula of Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references
Onyx and Apatite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Onyx and Apatite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Apatite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 3.16-3.23 whereas that of Apatite is 3.16-3.23.