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Glauconite Mineral Data
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General Glauconite Information
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 Chemical Formula: |
(K,Na)(Fe+++,Al,Mg)2(Si,Al)4O10(OH)2 |
| Composition: |
Molecular Weight = 426.93 gm |
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Potassium 5.49 % K 6.62 % K2O |
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Sodium 0.27 % Na 0.36 % Na2O |
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Magnesium 2.28 % Mg 3.78 % MgO |
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Aluminum 1.90 % Al 3.58 % Al2O3 |
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Iron 19.62 % Fe 3.37 % FeO / 24.31 % Fe2O3 |
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Silicon 25.00 % Si 53.48 % SiO2 |
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Hydrogen 0.47 % H 4.22 % H2O |
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Oxygen 44.97 % O |
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______ ______ |
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100.00 % 99.72 % = TOTAL OXIDE |
| Empirical Formula: |
K0.6Na0.05Fe3+1.3Mg0.4Fe2+0.2Al0.3Si3.8O10(OH)2 |
| Environment: |
Altered from detrital biotite by marine diagenesis in shallow water under reducing conditions; especially in sandstone. |
| IMA Status: |
Valid Species (Pre-IMA) 1828 |
| Locality: |
Otago Peninsula, New Zealand. Common world wide. Link to MinDat.org Location Data. |
| Name Origin: |
From the Greek "glaucos" for the blue green color. |
| Name Pronunciation: |
Glauconite + Pronunciation  |
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