Corundum and Astrophyllite Physical Properties
Tenacity
Brittle
Not Available
Solubility
insoluble
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.90-4.05
3.2-3.4
Fracture
Uneven, Uneven, Gems, Difficult, Fibrous
Uneven, Brittle, Metallic
Cleavage
None – parting in 3 directions
Perfect on [001] imperfect on [100]
Chemical Composition
Al 2O 3Arthur Thomas , Gemstones (2009)
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Corundum and Astrophyllite Chemical Formula
While comparing Corundum 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 Corundum and Astrophyllite chemical formula.
- Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
- Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Corundum and Astrophyllite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Corundum and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Corundum is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.