Mineralogy Database

Pentagonite Mineral Data

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General Pentagonite Information

Help on Chemical  Formula: Chemical Formula: Ca(VO)Si4O10•4(H2O)
Help on Composition: Composition: Molecular Weight = 451.42 gm
   Calcium    8.88 %  Ca   12.42 % CaO
   Vanadium  11.28 %  V    20.15 % V2O5
   Silicon   24.89 %  Si   53.24 % SiO2
   Hydrogen   1.79 %  H    15.96 % H2O
   Oxygen    53.16 %  O
            ______        ______ 
            100.00 %      101.77 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaV5+Si4O11•4(H2O)
Help on Environment: Environment: Alteration product occurring in basalts and tuffs.
Help on IMA Status: IMA Status: Approved IMA 1973
Help on Locality: Locality: Lake Owyhee State Park, Malheur County, and Goble, Columbia County, Oregon, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek, penta, "five" and angle in allusion to the fiveling twins common in this species.
Help on Name Pronunciation: Name Pronunciation: Pentagonite + Pronunciation Say PENTAGONITE
Help on Synonym: Synonym: ICSD 10262
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