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Brownmillerite Mineral Data
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General Brownmillerite Information
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 Chemical Formula: |
Ca2(Al,Fe+++)2O5 |
| Composition: |
Molecular Weight = 240.09 gm |
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Calcium 33.39 % Ca 46.71 % CaO |
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Aluminum 12.36 % Al 23.36 % Al2O3 |
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Iron 20.93 % Fe 26.93 % FeO |
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Oxygen 33.32 % O |
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______ ______ |
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100.00 % 97.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca2Al1.1Fe2+0.9O5 |
| Environment: |
Thermally metamorphosed limestone blocks included in volcanic rocks. |
| IMA Status: |
Approved IMA 1964 |
| Locality: |
Ettringer-Bellerberg volcano, near Mayen, Eifel district, Germay. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Lorrin Thomas Brownmiller (1902-), Chef chemist of the Alpha Portland Cement Company, Easton, Pennsylvania, USA. |
| Name Pronunciation: |
Brownmillerite + Pronunciation  |
| Synonym: |
ICSD 9197 |
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PDF 30-226 |
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