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Griffithite Mineral Data
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General Griffithite Information
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 Chemical Formula: |
4(Mg,Fe,Ca)O.(Al,Fe)2O3.5SiO2•7(H2O) |
| Composition: |
Molecular Weight = 764.30 gm |
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Calcium 2.10 % Ca 2.93 % CaO |
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Magnesium 7.63 % Mg 12.66 % MgO |
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Aluminum 5.30 % Al 10.01 % Al2O3 |
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Iron 12.42 % Fe 11.28 % FeO / 5.22 % Fe2O3 |
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Silicon 18.37 % Si 39.31 % SiO2 |
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Hydrogen 1.85 % H 16.50 % H2O |
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Oxygen 52.33 % O |
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______ ______ |
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100.00 % 97.91 % = TOTAL OXIDE |
| Empirical Formula: |
Mg2.4Fe2+1.2Ca0.4Al1.5Fe3+0.5Si5O18�7(H2O) |
| Environment: |
Amygdaloidal cavities in basalt. A variety of ferroan saponite. |
| IMA Status: |
Not Approved IMA |
| Locality: |
Cahuenga Pass, Griffith Park, Los Angeles, California, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named after its locality. |
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