Petalite and Ludlamite Physical Properties
Specific Gravity
2.40
3.1-3.2
Fracture
Subconchoidal, ConchoidalWalter Schumann, Conchoidal
-
Cleavage
Perfect on {001}, poor on {201} with 38.5° angle between the two
Vitreous, pearly on cleavage
Chemical Composition
LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Petalite and Ludlamite Chemical Formula
While comparing Petalite and Ludlamite 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 Petalite and Ludlamite chemical formula.
- Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
- Chemical formula of Ludlamite- (Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Petalite and Ludlamite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Petalite and Ludlamite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Petalite and Ludlamite Optical Properties during the identification of gemstone. Specific gravity of Petalite is 3.1-3.2 whereas that of Ludlamite is 3.1-3.2.