Astrophyllite and Erythrite Physical Properties
Tenacity
Not Available
Sectile
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.2-3.4
3.06
Fracture
Uneven, Brittle, Metallic
Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Cleavage
Perfect on [001] imperfect on [100]
Perfect on {010}; poor on {100} and { 1 02}.
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)
Co3(AsO4)2•8(H2O)
Astrophyllite and Erythrite Chemical Formula
While comparing Astrophyllite and Erythrite 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 Erythrite 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 Erythrite- Co3(AsO4)2•8(H2O)
Astrophyllite and Erythrite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Astrophyllite and Erythrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Erythrite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.06 whereas that of Erythrite is 3.06.