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Tounkite Mineral Data
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General Tounkite Information
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 Chemical Formula: |
(Na,Ca,K)8Al6Si6O24(SO4)2Cl•(H2O) |
| Composition: |
Molecular Weight = 1,204.49 gm |
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Potassium 5.19 % K 6.26 % K2O |
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Sodium 7.44 % Na 10.03 % Na2O |
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Calcium 7.65 % Ca 10.71 % CaO |
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Aluminum 13.22 % Al 24.97 % Al2O3 |
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Silicon 14.22 % Si 30.43 % SiO2 |
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Hydrogen 0.17 % H 1.50 % H2O |
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Sulfur 5.32 % S 13.29 % SO3 |
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Chlorine 2.94 % Cl 2.94 % Cl |
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- %
Cl -0.66 % -O=Cl2 |
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Oxygen 43.83 % O |
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______ ______ |
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100.00 % 99.47 % = TOTAL OXIDE |
| Empirical Formula: |
Na3.9Ca2.3K1.6Si6.1Al5.9O24(SO4)2Cl•(H2O) |
| Environment: |
Replaces lazurite in diopside-lazurite rocks. |
| IMA Status: |
Approved IMA 1992 |
| Locality: |
Malaya Bystraya and Tultuy lazurite deposits, south of Lake Baikal, Siberia, Russia. Link to MinDat.org Location Data. |
| Name Origin: |
Named after the Tunka (Tounka) Valley near the deposits. |
| Name Pronunciation: |
Tounkite  |
| Synonym: |
IMA1990-009 |
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