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Stilpnomelane Mineral Data
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General Stilpnomelane Information
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 Chemical Formula: |
K(Fe++,Mg,Fe+++)8(Si,Al)12(O,OH)27•n(H2O) |
| Composition: |
Molecular Weight = 1,247.57 gm |
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Potassium 3.13 % K |
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Magnesium 2.73 % Mg |
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Aluminum 4.33 % Al |
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Iron 29.54 % Fe |
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Silicon 22.51 % Si |
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Hydrogen 0.57 % H |
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Oxygen 37.19 % O |
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______ |
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100.00 % |
| Empirical Formula: |
KFe2+4.3Mg1.4Fe3+2.3Si10Al2O24(OH)3�2(H2O) |
| Environment: |
Commonly associated with iron ores. |
| IMA Status: |
Valid Species (Pre-IMA) 1827 |
| Locality: |
Moravia of Czechoslovakia at Sternberg in a bed of limonite. Link to MinDat.org Location Data. |
| Name Origin: |
From the Greek for "shining" and "black", in allusion to its luster and color. |
| Name Pronunciation: |
Stilpnomelane + Pronunciation  |
| Synonym: |
Ferristilpnomelane - high Fe+++ |
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Ferrostilpnomelane - Low Fe+++ |
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