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