Almandine and Prehnite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.95-4.30
2.80-2.95
Fracture
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic
Cleavage
none
Distinct on [001]
Mohs Hardness
7-7.5
6-6.5
Chemical Composition
Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Ca2Al2Si3O12(OH)
Almandine and Prehnite Chemical Formula
While comparing Almandine and Prehnite 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 Almandine and Prehnite chemical formula.
- Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
- Chemical formula of Prehnite- Ca2Al2Si3O12(OH)
Almandine and Prehnite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Almandine and Prehnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Almandine and Prehnite Optical Properties during the identification of gemstone. Specific gravity of Almandine is 2.80-2.95 whereas that of Prehnite is 2.80-2.95.