Ettringite and Petalite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Partially soluble in water
insoluble
Durability
Not Available
Not Available
Specific Gravity
1.77
2.40
Fracture
Not Available
Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
Cleavage
Perfect on {10 1 0}
Perfect on {001}, poor on {201} with 38.5° angle between the two
Mohs Hardness
2-2.5
6-6.5
Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ettringite and Petalite Chemical Formula
While comparing Ettringite 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 Ettringite and Petalite chemical formula.
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ettringite and Petalite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Ettringite and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Petalite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.40 whereas that of Petalite is 2.40.