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Forsterite
Forsterite

Lazurite
Lazurite



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Forsterite
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Lazurite

Forsterite and Lazurite Physical Properties

Physical Properties

Tenacity

-
Brittle

Solubility

-
Soluble

Durability

-
-

Specific Gravity

3.23-3.262.75
1 7.18
👆🏻

Fracture

Conchoidal
Uneven, Conchoidal

Cleavage

Perfect on {010} imperfect on {100}
Imperfect on {110}

Mohs Hardness

6.5-75.5
2 10
👆🏻

Chemical Composition

Mg 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006)
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

Forsterite and Lazurite Chemical Formula

While comparing Forsterite and Lazurite 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 Lazurite chemical formula.

  • Chemical formula of Forsterite- Mg 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006)
  • Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

Forsterite and Lazurite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Forsterite and Lazurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Forsterite and Lazurite Optical Properties during the identification of gemstone. Specific gravity of Forsterite is 2.75 whereas that of Lazurite is 2.75.