Austinite and Almandine Physical Properties
Tenacity
Brittle
Not Available
Solubility
Easily soluble in cold dilute HCl
Not Available
Durability
Not Available
Not Available
Specific Gravity
4.12
3.95-4.30
Fracture
Brittle, Uneven, Brittle, Uneven
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Cleavage
Good in two directions parallel to the prism faces {110}
none
Mohs Hardness
4-4.5
7-7.5
Chemical Composition
CaZn(AsO4)(OH)
Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Austinite and Almandine Chemical Formula
While comparing Austinite and Almandine 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 Austinite and Almandine chemical formula.
- Chemical formula of Austinite- CaZn(AsO4)(OH)
- Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Austinite and Almandine Specific Gravity
Another important criteria for qualitative analysis of gemstones is Austinite and Almandine Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Austinite and Almandine Optical Properties during the identification of gemstone. Specific gravity of Austinite is 3.95-4.30 whereas that of Almandine is 3.95-4.30.