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Magnesite
Magnesite

Opal
Opal



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Magnesite
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Opal

Magnesite and Opal Physical Properties

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Physical Properties

Tenacity

Brittle
BrittleWalter Schumann

Solubility

Effervesces in hot HCl
hot salt water

Durability

-
-

Specific Gravity

2.92-3.121.98-2.25
1 7.18
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Fracture

Conchoidal
Conchoidal

Cleavage

[10 1 1] perfect
None

Mohs Hardness

3.5-4.55-6.5
2 10
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Chemical Composition

MgCO 3Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
SiO2 · nH2O

Magnesite and Opal Chemical Formula

While comparing Magnesite and Opal 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 Magnesite and Opal chemical formula.

  • Chemical formula of Magnesite- MgCO 3Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
  • Chemical formula of Opal- SiO2 · nH2O

Magnesite and Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Magnesite and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Magnesite and Opal Optical Properties during the identification of gemstone. Specific gravity of Magnesite is 1.98-2.25 whereas that of Opal is 1.98-2.25.