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Magnesiohornblende Mineral Data
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General Magnesiohornblende Information
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 Chemical Formula: |
Ca2[Mg4(Al,Fe+++)]Si7AlO22(OH)2 |
| Composition: |
Molecular Weight = 821.16 gm |
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Calcium 9.76 % Ca 13.66 % CaO |
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Magnesium 11.84 % Mg 19.63 % MgO |
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Aluminum 5.75 % Al 10.86 % Al2O3 |
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Iron 1.70 % Fe 2.43 % Fe2O3 |
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Silicon 23.94 % Si 51.22 % SiO2 |
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Hydrogen 0.25 % H 2.19 % H2O |
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Oxygen 46.76 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca2Mg4Al0.75Fe3+0.25(Si7AlO22)(OH)2 |
| Environment: |
Igneous and metamorphic rocks. |
| IMA Status: |
Approved IMA 1978 |
| Locality: |
Probably common worldwide in "hornblende" granites and shists. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the composition and its relationship to hornblende. |
| Synonym: |
Aluminomagnesiohornblende |
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Hornblende |
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ICSD 79834 |
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PDF 45-1371 |
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