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Fenaksite Mineral Data
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General Fenaksite Information
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 Chemical Formula: |
(K,Na,Ca)4(Fe++,Fe+++,Mn)2Si8O20(OH,F) |
| Composition: |
Molecular Weight = 806.42 gm |
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Potassium 8.73 % K 10.51 % K2O |
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Sodium 4.28 % Na 5.76 % Na2O |
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Calcium 3.48 % Ca 4.87 % CaO |
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Manganese 2.04 % Mn 2.64 % MnO |
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Iron 11.77 % Fe 11.58 % FeO / 3.96 % Fe2O3 |
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Silicon 27.86 % Si 59.61 % SiO2 |
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Hydrogen 0.10 % H 0.89 % H2O |
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Oxygen 41.27 % O |
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Fluorine 0.47 % F 0.47 % F |
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- %
F -0.20 % -O=F2 |
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______ ______ |
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100.00 % 100.10 % = TOTAL OXIDE |
| Empirical Formula: |
K1.8Na1.5Ca0.7Fe2+1.3Fe3+0.4Mn2+0.3Si8O20(OH)0.8F0.2 |
| Environment: |
In pegmatites associated with an ijolite-urtite intrusion in a differentiated alkalic massif. |
| IMA Status: |
Approved IMA 1959 |
| Locality: |
On Mts. Rasvumchorr and Yukspor, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the Fe, Na, K, and Si in the formula. |
| Name Pronunciation: |
Fenaksite + Pronunciation  |
| Synonym: |
ICSD 20098 |
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PDF 13-520 |
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