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Menezesite Mineral Data
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General Menezesite Information
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 Chemical Formula: |
Ba2MgZr4(BaNb12O42)•12H2O |
| Composition: |
Molecular Weight = 2,778.48 gm |
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Potassium 0.75 % K 0.90 % K2O |
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Barium 10.82 % Ba 12.09 % BaO |
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Sodium 0.05 % Na 0.07 % Na2O |
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Calcium 0.45 % Ca 0.63 % CaO |
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Lanthanum 0.10 % La 0.12 % La2O3 |
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Cerium 0.86 % Ce 1.00 % Ce2O3 |
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Thorium 4.59 % Th 5.23 % ThO2 |
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Magnesium 0.82 % Mg 1.36 % MgO |
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Zirconium 9.03 % Zr 12.20 % ZrO2 |
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Uranium 0.17 % U 0.19 % UO2 |
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Tantalum 2.34 % Ta 2.86 % Ta2O5 |
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Titanium 5.60 % Ti 9.34 % TiO2 |
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Manganese 0.45 % Mn 0.59 % MnO |
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Niobium 30.86 % Nb 44.15 % Nb2O5 |
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Aluminum 0.03 % Al 0.06 % Al2O3 |
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Iron 0.46 % Fe 0.59 % FeO |
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Silicon 0.12 % Si 0.26 % SiO2 |
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Hydrogen 0.87 % H 7.78 % H2O |
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Neodymium 0.52 % Nd 0.61 % Nd2O3 |
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Oxygen 31.09 % O |
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______ ______ |
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100.00 % 100.02 % = TOTAL OXIDE |
| Empirical Formula: |
Ba1.47K0.53Ca0.31Ce0.17Nd0.1Na0.06La0.02Mg0.94Mn2+0.23Fe2+0.23Al0.03Zr2.75Ti0.96
Th0.29Ba0.72Th0.26U0.02Nb9.23Ti2.29�12(H2O) |
| Environment: |
Occurs in the contact zone between dolomite carbonatite and "jacupirangite" (=a pyroxenite). First natural heteropolyniobate. |
| IMA Status: |
Approved IMA 2005 (Dana # Added) |
| Locality: |
Jacupiranga mine, Cajati County, S�o Paulo, Brazil. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Luiz Alberto Dias Menezes Filho (born 1950), mining engineer, mineral collector, and merchant |
| Synonym: |
IMA2005-023 |
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