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Protoanthophyllite Mineral Data
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General Protoanthophyllite Information
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 Chemical Formula: |
(Mg,Fe)7Si8O22(OH)2 |
| Composition: |
Molecular Weight = 801.60 gm |
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Sodium 0.17 % Na 0.23 % Na2O |
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Magnesium 19.13 % Mg 31.73 % MgO |
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Manganese 0.07 % Mn 0.09 % MnO |
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Aluminum 0.47 % Al 0.89 % Al2O3 |
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Iron 4.25 % Fe 5.47 % FeO |
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Silicon 27.68 % Si 59.21 % SiO2 |
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Nickel 0.07 % Ni 0.09 % NiO |
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Hydrogen 0.25 % H 2.25 % H2O |
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Oxygen 47.90 % O |
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______ ______ |
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100.00 % 99.96 % = TOTAL OXIDE |
| Empirical Formula: |
Mg6.31Fe2+0.61Na0.06Mn2+0.01Ni0.01Si7.9Al0.14O22(OH)2 |
| Environment: |
Contact metamorphosed Takase ultramafic complex (serpentinites). |
| IMA Status: |
Approved IMA 2003 (Dana # Added) |
| Locality: |
Drill-core sample from the waste dump of the abandoned Takase chromite mine, Okayama Prefecture, Japan. Link to MinDat.org Location Data. |
| Name Origin: |
Named as the proto-type analog of anthophyllite. The prefix proto refers to a half-rotation about the b axis between successive layers of octahedra. |
| Synonym: |
IMA2001-065 |
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