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Epistolite Mineral Data
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General Epistolite Information
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 Chemical Formula: |
(Na,[ ])2{(Na,Ti)4[Nb2(O,H2O)4Si4O14](OH,F)2}•2H2O |
| Composition: |
Molecular Weight = 758.20 gm |
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Sodium 11.49 % Na 15.49 % Na2O |
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Calcium 1.43 % Ca 2.00 % CaO |
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Titanium 0.25 % Ti 0.42 % TiO2 |
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Manganese 0.29 % Mn 0.37 % MnO |
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Niobium 23.53 % Nb 33.66 % Nb2O5 |
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Iron 0.29 % Fe 0.42 % Fe2O3 |
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Silicon 14.82 % Si 31.70 % SiO2 |
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Hydrogen 1.25 % H 11.21 % H2O |
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Oxygen 45.24 % O |
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Fluorine 1.40 % F 1.40 % F |
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- %
F -0.59 % -O=F2 |
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______ ______ |
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100.00 % 96.09 % = TOTAL OXIDE |
| Empirical Formula: |
Na3.79Ca0.27Mn2+0.04Nb1.92Ti0.04Fe3+0.04(Si2O7)2O2(OH)1.44F0.56�4(H2O) |
| IMA Status: |
Valid Species (Pre-IMA) 1897 |
| Locality: |
Tugtupagtakorfia, Kvanefield, and Taseq slope, Ilimaussag intrusion, Julianehaab area, southern Greenland. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the Greek for "letter" in allusion to the flat, rectangular form and white color. |
| Name Pronunciation: |
Epistolite + Pronunciation  |
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