Astrophyllite and Petalite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
insoluble
Durability
Not Available
Not Available
Specific Gravity
3.2-3.4
2.40
Fracture
Uneven, Brittle, Metallic
Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
Cleavage
Perfect on [001] imperfect on [100]
Perfect on {001}, poor on {201} with 38.5° angle between the two
Chemical Composition
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Astrophyllite and Petalite Chemical Formula
While comparing Astrophyllite and Petalite 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 Petalite 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 Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Astrophyllite and Petalite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Astrophyllite and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Petalite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.40 whereas that of Petalite is 2.40.