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Ralstonite Mineral Data
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General Ralstonite Information
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 Chemical Formula: |
NaxMgxAl2-x(F,OH)6•(H2O) |
| Composition: |
Molecular Weight = 192.14 gm |
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Sodium 5.98 % Na 8.06 % Na2O |
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Magnesium 6.32 % Mg 10.49 % MgO |
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Aluminum 21.06 % Al 39.80 % Al2O3 |
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Hydrogen 2.10 % H 18.75 % H2O |
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Oxygen 24.98 % O |
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Fluorine 39.55 % F 39.55 % F |
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- %
F -16.65 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Na0.5Mg0.5Al1.5F4(OH)2•(H2O) |
| Environment: |
Alteration product of cryolite. |
| IMA Status: |
Valid Species (Pre-IMA) 1871 |
| Locality: |
Ivigtut, Greenland. Link to MinDat.org Location Data. |
| Name Origin: |
Named for J. Grier Ralston (1851-1880) of Norristown, Pennsylvania, USA, who first observed the mineral. |
| Name Pronunciation: |
Ralstonite + Pronunciation  |
| Synonym: |
Boldyrevite - impure ralstonite or gearksutite |
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ICSD 31345 |
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PDF 45-1331 |
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