Topaz and Astrophyllite Physical Properties
Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.49-3.57
3.2-3.4
Fracture
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Uneven, Brittle, Metallic
Cleavage
[001] Perfect
Perfect on [001] imperfect on [100]
Mohs Hardness
8
3
Chemical Composition
Al2SiO4(F,OH)2
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Topaz and Astrophyllite Chemical Formula
While comparing Topaz and Astrophyllite 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 Topaz and Astrophyllite chemical formula.
- Chemical formula of Topaz- Al2SiO4(F,OH)2
- Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Topaz and Astrophyllite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Topaz and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Topaz is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.
