Amethyst and Astrophyllite Physical Properties
Tenacity
Not Available
Not Available
Solubility
insoluble in common solvents
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.65
3.2-3.4
Fracture
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
Uneven, Brittle, Metallic
Cleavage
Indiscernible
Perfect on [001] imperfect on [100]
Chemical Composition
SiO2
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Amethyst and Astrophyllite Chemical Formula
While comparing Amethyst 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 Amethyst and Astrophyllite chemical formula.
- Chemical formula of Amethyst- SiO2
- Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Amethyst and Astrophyllite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Amethyst and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Amethyst and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Amethyst is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.