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Vermiculite Mineral Data
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General Vermiculite Information
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 Chemical Formula: |
(Mg,Fe++,Al)3(Al,Si)4O10(OH)2•4(H2O) |
| Composition: |
Molecular Weight = 504.19 gm |
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Magnesium 8.68 % Mg 14.39 % MgO |
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Aluminum 23.01 % Al 43.48 % Al2O3 |
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Iron 9.97 % Fe 12.82 % FeO |
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Silicon 5.57 % Si 11.92 % SiO2 |
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Hydrogen 2.00 % H 17.87 % H2O |
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Oxygen 50.77 % O |
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______ ______ |
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100.00 % 100.48 % = TOTAL OXIDE |
| Empirical Formula: |
Mg1.8Fe2+0.9Al4.3SiO10(OH)2•4(H2O) |
| Environment: |
Appears to have been formed by weathering or hydrothermal alteration of iron-bearing phlogopite an annite. |
| IMA Status: |
Valid Species (Pre-IMA) 1824 |
| Locality: |
Millbury, Worchaster County, MA, USA Link to MinDat.org Location Data. |
| Name Origin: |
From the Latin vermiculus, "little worm." |
| Name Pronunciation: |
Vermiculite + Pronunciation  |
| Synonym: |
Batavite - Fe-poor variety of vermiculite |
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Hydrobiotite |
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Hydromica |
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Jeffersinite |
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