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