Neptunite and Topaz Physical Properties
Tenacity
Brittle
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.19-3.23
3.49-3.57
Fracture
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Cleavage
{110} good
[001] Perfect
Chemical Composition
KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael OâDonoghue , Gems, Sixth Edition (2006)
Al2SiO4(F,OH)2
Neptunite and Topaz Chemical Formula
While comparing Neptunite and Topaz 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 Neptunite and Topaz chemical formula.
- Chemical formula of Neptunite- KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Topaz- Al2SiO4(F,OH)2
Neptunite and Topaz Specific Gravity
Another important criteria for qualitative analysis of gemstones is Neptunite and Topaz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Neptunite and Topaz Optical Properties during the identification of gemstone. Specific gravity of Neptunite is 3.49-3.57 whereas that of Topaz is 3.49-3.57.