Astrophyllite and Vivianite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.2-3.4
2.64-2.70
Fracture
Uneven, Brittle, Metallic
(e.g. graphite).
Cleavage
Perfect on [001] imperfect on [100]
{010} Perfect
Mohs Hardness
3
Not Available
Chemical Composition
(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.
Astrophyllite and Vivianite Chemical Formula
While comparing Astrophyllite and Vivianite 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 Astrophyllite and Vivianite chemical formula.
- Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
- Chemical formula of Vivianite- Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.
Astrophyllite and Vivianite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Astrophyllite and Vivianite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Vivianite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.64-2.70 whereas that of Vivianite is 2.64-2.70.