Ettringite and Lazurite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Partially soluble in water
Soluble
Durability
Not Available
Not Available
Specific Gravity
1.77
2.75
Fracture
Not Available
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Cleavage
Perfect on {10 1 0}
Imperfect on {110}
Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Ettringite and Lazurite Chemical Formula
While comparing Ettringite and Lazurite 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 Lazurite chemical formula.
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Ettringite and Lazurite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Ettringite and Lazurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Lazurite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.75 whereas that of Lazurite is 2.75.