Ettringite and Astrophyllite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Partially soluble in water
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.77
3.2-3.4
Fracture
Not Available
Uneven, Brittle, Metallic
Cleavage
Perfect on {10 1 0}
Perfect on [001] imperfect on [100]
Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Ettringite and Astrophyllite Chemical Formula
While comparing Ettringite and Astrophyllite 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 Astrophyllite chemical formula.
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Ettringite and Astrophyllite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Ettringite and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.