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Johntomaite Mineral Data
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General Johntomaite Information
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 Chemical Formula: |
Ba(Fe++,Ca,Mn++)2Fe+++2(PO4)3(OH)3 |
| Composition: |
Molecular Weight = 690.07 gm |
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Barium 19.90 % Ba 22.22 % BaO |
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Calcium 2.32 % Ca 3.25 % CaO |
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Manganese 2.39 % Mn 3.08 % MnO |
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Iron 26.71 % Fe 13.53 % FeO / 23.14 % Fe2O3 |
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Phosphorus 13.47 % P 30.85 % P2O5 |
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Hydrogen 0.44 % H 3.92 % H2O |
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Oxygen 34.78 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
BaFe2+1.3Ca0.4Mn2+0.3Fe3+2(PO4)3(OH)3 |
| Environment: |
Occurs as an extremely rare mineral on the mine dumps. Fe 2+ -analogue of perloffite and new member of the bjarebyite group of barium phosphates. |
| IMA Status: |
Approved IMA 1999 (Dana # Added) |
| Locality: |
Spring Creek copper mine near Wilmington in the southern Flinders Ranges of South Australia. Link to MinDat.org Location Data. |
| Name Origin: |
Named after Mr. John Toma, amateur mineralogist and finder of the mineral. |
| Synonym: |
IMA1999-009 |
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