Mineralogy Database

Opal Mineral Data

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General Opal Information

Help on Chemical  Formula: Chemical Formula: SiO2•n(H2O)
Help on Composition: Composition: Molecular Weight = 87.11 gm
   Silicon   32.24 %  Si   68.98 % SiO2
   Hydrogen   3.47 %  H    31.02 % H2O
   Oxygen    64.29 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: SiO2•1.5(H2O)
Help on Environment: Environment: Sedimentary and secondary from the alteration of high silica igneous extrusive rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) Prehistoric
Help on Locality: Locality: World wide occurrences. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Old Indian upala - "precious stone."
Help on Name Pronunciation: Name Pronunciation: Opal Say OPAL
Help on Synonym: Synonym: Fire Opal - red
  Hyalite - glassy
  Hydrophane - porous
  Prase - green
  Precious opal - opalescent