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Anorthite Mineral Data
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General Anorthite Information
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 Chemical Formula: |
CaAl2Si2O8 |
| Composition: |
Molecular Weight = 277.41 gm |
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Sodium 0.41 % Na 0.56 % Na2O |
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Calcium 13.72 % Ca 19.20 % CaO |
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Aluminum 18.97 % Al 35.84 % Al2O3 |
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Silicon 20.75 % Si 44.40 % SiO2 |
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Oxygen 46.14 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Na0.05Ca0.95Al1.95Si2.05O8 |
| Environment: |
Magmatic and metamorphic rocks. |
| IMA Status: |
Valid Species (Pre-IMA) 1823 |
| Locality: |
Monte Somma and Valle di Fassa, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
From the Greek, an + orthos, "not upright" in allusion to the oblique crystals. |
| Name Pronunciation: |
Anorthite + Pronunciation  |
| Synonym: |
Ab0 |
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An100 |
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ICSD 654 |
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Indianite |
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PDF 41-1486 |
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