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