Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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High-Temperature Reactions of Alkali and Plagioclase Feldspars With Alkali and Alkaline Earth Chlorides: Formation of Celsian


Affiliations
1 Department of Inorganic and Physical Chemisty, Indian Institute of Science, Bangalore-560 012, India
2 Instrumentation and Services Unit, Indian Institute of Science, Bangalore-560 012, India
     

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High-temperature reactions (Ca 900°C) involving albite, K-feldspar or plagioclase and K, Ba-or K, Sr chlorides were experimentally studied. These experiments reveal that the reaction between K-exchanged albite, potash feldspar, or plagioclase and Ba-chloride/Ba-K chloride results in the formation of celsian by the breakdown of the starting feldspar structure above 800°C. Sr-feldspar does not form under similar conditions. A size-effect of the large M-site cation appears to be responsible for the formation of celsian. The reaction between K-feldspar and barium chloride may be used as a method for synthesizing celsian.

Keywords

Albite, K-Feldspar, Plagioclase, Celsian, Igneous Petrology.
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  • High-Temperature Reactions of Alkali and Plagioclase Feldspars With Alkali and Alkaline Earth Chlorides: Formation of Celsian

Abstract Views: 167  |  PDF Views: 1

Authors

V. Swamy
Department of Inorganic and Physical Chemisty, Indian Institute of Science, Bangalore-560 012, India
A. G. Menon
Instrumentation and Services Unit, Indian Institute of Science, Bangalore-560 012, India
G. V. Anantha Iyer
Department of Inorganic and Physical Chemisty, Indian Institute of Science, Bangalore-560 012, India

Abstract


High-temperature reactions (Ca 900°C) involving albite, K-feldspar or plagioclase and K, Ba-or K, Sr chlorides were experimentally studied. These experiments reveal that the reaction between K-exchanged albite, potash feldspar, or plagioclase and Ba-chloride/Ba-K chloride results in the formation of celsian by the breakdown of the starting feldspar structure above 800°C. Sr-feldspar does not form under similar conditions. A size-effect of the large M-site cation appears to be responsible for the formation of celsian. The reaction between K-feldspar and barium chloride may be used as a method for synthesizing celsian.

Keywords


Albite, K-Feldspar, Plagioclase, Celsian, Igneous Petrology.