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Barroisite Mineral Data
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General Barroisite Information
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 Chemical Formula: |
[ ](CaNa)Mg3AlFe+++Si7AlO22(OH)2 |
| Composition: |
Molecular Weight = 828.39 gm |
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Sodium 2.78 % Na 3.74 % Na2O |
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Calcium 4.84 % Ca 6.77 % CaO |
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Magnesium 8.80 % Mg 14.60 % MgO |
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Aluminum 6.51 % Al 12.31 % Al2O3 |
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Iron 6.74 % Fe 9.64 % Fe2O3 |
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Silicon 23.73 % Si 50.77 % SiO2 |
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Hydrogen 0.24 % H 2.17 % H2O |
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Oxygen 46.35 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
CaNaMg3AlFe3+(Si7AlO22)(OH)2 |
| Environment: |
In blueschist facies Metamorphic rocks. |
| IMA Status: |
Valid Species (Pre-IMA) 1922 |
| Locality: |
Along Cleary Creek, 20 km north of Fairbanks, and on the northwest side of Kodiak Island, Alaska, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Not given in original paper. |
| Name Pronunciation: |
Barroisite + Pronunciation  |
| Synonym: |
(Alumino)barroisite - of Dana |
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