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Ottrelite Mineral Data
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General Ottrelite Information
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 Chemical Formula: |
(Mn,Fe++,Mg)2Al4Si2O10(OH)4 |
| Composition: |
Molecular Weight = 490.11 gm |
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Magnesium 2.48 % Mg 4.11 % MgO |
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Manganese 10.09 % Mn 13.03 % MnO |
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Aluminum 21.47 % Al 40.57 % Al2O3 |
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Iron 7.98 % Fe 8.80 % FeO / 1.63 % Fe2O3 |
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Silicon 11.46 % Si 24.52 % SiO2 |
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Hydrogen 0.82 % H 7.35 % H2O |
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Oxygen 45.70 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Mn2+0.9Fe2+0.6Mg0.5Al3.9Fe3+0.1Si2O10(OH)4 |
| Environment: |
Formed under non-shearing stress conditions in veins and cavities within low- to medium-grade metamorphic rocks. |
| IMA Status: |
Valid Species (Pre-IMA) 1819 |
| Locality: |
In Belgium, in the Ardennes Mountains, from Ottre, Salmchateau, and Veilsalm. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Ottrelite + Pronunciation  |
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