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Astrophyllite Mineral Data
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General Astrophyllite Information
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 Chemical Formula: |
K2Na(Fe++,Mn)7Ti2Si8O26(OH)4 |
| Composition: |
Molecular Weight = 1,289.00 gm |
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Potassium 6.07 % K 7.31 % K2O |
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Sodium 1.78 % Na 2.40 % Na2O |
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Magnesium 1.41 % Mg 2.35 % MgO |
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Titanium 7.43 % Ti 12.39 % TiO2 |
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Manganese 4.26 % Mn 5.50 % MnO |
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Iron 22.75 % Fe 29.26 % FeO |
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Silicon 17.43 % Si 37.29 % SiO2 |
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Hydrogen 0.27 % H 2.45 % H2O |
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Oxygen 37.86 % O |
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Fluorine 0.74 % F 0.74 % F |
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- %
F -0.31 % -O=F2 |
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______ ______ |
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100.00 % 99.38 % = TOTAL OXIDE |
| Empirical Formula: |
K2NaFe2+5.25Mn2+Mg0.75Ti2Si8O27(OH)3.5F0.5 |
| Environment: |
Mineral in zircon-bearing syenites. |
| IMA Status: |
Valid Species (Pre-IMA) 1854 |
| Locality: |
Langesundfiord, near Brevik, Norway. Link to MinDat.org Location Data. |
| Name Origin: |
From the Greek aster - "star" and fyllon - "leaf." |
| Name Pronunciation: |
Astrophyllite + Pronunciation  |
| Synonym: |
ICSD 24911 |
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PDF 41-1490 |
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