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Pyrope
Pyrope

Spinel
Spinel



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Pyrope
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Pyrope and Spinel Physical Properties

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1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
insoluble in water
none
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.62-3.87
3.64-3.66
1.5 Fracture
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
1.6 Cleavage
None
None, but may exhibit slight parting
1.7 Mohs Hardness
7-7.5
8
1.8 Chemical Composition
Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
MgAl2O4

Pyrope and Spinel Chemical Formula

While comparing Pyrope and Spinel 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 Pyrope and Spinel chemical formula.

  • Chemical formula of Pyrope- Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
  • Chemical formula of Spinel- MgAl2O4

Pyrope and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pyrope and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pyrope and Spinel Optical Properties during the identification of gemstone. Specific gravity of Pyrope is 3.64-3.66 whereas that of Spinel is 3.64-3.66.