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Fluorite
Fluorite

Opal
Opal



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Fluorite
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Opal

Fluorite and Opal Physical Properties

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Physical Properties

Tenacity

Brittle
BrittleWalter Schumann

Solubility

slightly water soluble and in hot hydrochloric acid
hot salt water

Durability

-
-

Specific Gravity

3.00-3.251.98-2.25
1 7.18
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Fracture

Subconchoidal, Uneven, ConchoidalWalter Schumann
Conchoidal

Cleavage

Octahedral, perfect on {111}, parting on {011}
None

Mohs Hardness

45-6.5
2 10
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Chemical Composition

CaF2
SiO2 · nH2O

Fluorite and Opal Chemical Formula

While comparing Fluorite 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 Fluorite and Opal chemical formula.

  • Chemical formula of Fluorite- CaF2
  • Chemical formula of Opal- SiO2 · nH2O

Fluorite and Opal Specific Gravity

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