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Megacyclite Mineral Data
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General Megacyclite Information
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 Chemical Formula: |
Na8KSi9O18(OH)9•19(H2O) |
| Composition: |
Molecular Weight = 1,250.12 gm |
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Potassium 3.13 % K 3.77 % K2O |
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Sodium 14.71 % Na 19.83 % Na2O |
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Silicon 20.22 % Si 43.26 % SiO2 |
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Hydrogen 3.71 % H 33.14 % H2O |
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Oxygen 58.23 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Na8KSi9O18(OH)9•18.5(H2O) |
| Environment: |
In unweathered ultra-alkalic pegmatites in an alkalic massif. Turns white on exposure to air. |
| IMA Status: |
Approved IMA 1993 |
| Locality: |
On Mt. Rasvumchorr, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data. |
| Name Origin: |
From the Greek for large and cyclical, with reference to the large ringlike groups of silica tetrahedra in the structure. |
| Name Pronunciation: |
Megacyclite + Pronunciation  |
| Synonym: |
IMA1991-015 |
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