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Forsterite
Forsterite

Pyrope
Pyrope



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Forsterite
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Pyrope

Forsterite and Pyrope Physical Properties

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Physical Properties

Tenacity

-
-

Solubility

-
insoluble in water

Durability

-
-

Specific Gravity

3.23-3.263.62-3.87
1 7.18
👆🏻

Fracture

Conchoidal
Conchoidal

Cleavage

Perfect on {010} imperfect on {100}
None

Mohs Hardness

6.5-77-7.5
2 10
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Chemical Composition

Mg 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006)
Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Forsterite and Pyrope Chemical Formula

While comparing Forsterite and Pyrope 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 Forsterite and Pyrope chemical formula.

  • Chemical formula of Forsterite- Mg 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006)
  • Chemical formula of Pyrope- Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Forsterite and Pyrope Specific Gravity

Another important criteria for qualitative analysis of gemstones is Forsterite and Pyrope Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Forsterite and Pyrope Optical Properties during the identification of gemstone. Specific gravity of Forsterite is 3.62-3.87 whereas that of Pyrope is 3.62-3.87.