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Opal
Opal

Scheelite
Scheelite



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Opal
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Opal and Scheelite Physical Properties

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Physical Properties

Tenacity

BrittleWalter Schumann
Brittle

Solubility

hot salt water
-

Durability

-
-

Specific Gravity

1.98-2.255.9-6.3
1 7.18
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Fracture

Conchoidal
Conchoidal, Uneven

Cleavage

None
On {101}, distinct; on {112}, interrupted; on {001}, indistinct

Mohs Hardness

5-6.54.5-5
2 10
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Chemical Composition

SiO2 · nH2O
CaWO 4Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Opal and Scheelite Chemical Formula

While comparing Opal and Scheelite 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 Opal and Scheelite chemical formula.

  • Chemical formula of Opal- SiO2 · nH2O
  • Chemical formula of Scheelite- CaWO 4Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Opal and Scheelite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Opal and Scheelite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Opal and Scheelite Optical Properties during the identification of gemstone. Specific gravity of Opal is 5.9-6.3 whereas that of Scheelite is 5.9-6.3.