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Kenyte : ウィキペディア英語版
Kenyte

Kenyte is a variety of porphyritic phonolite or trachyte with rhomb shaped phenocrysts of anorthoclase with variable olivine and augite in a glassy matrix. It was originally described and named by J. W. Gregory in 1900 for the occurrence on Mount Kenya.〔Roger Walter Le Maître, ''Igneous Rocks: A Classification and Glossary of Terms: Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks,'' Cambridge University Press; 2nd ed., 2002, p. 96 ISBN 978-0-521-66215-4〕〔J. W. Gregory, ''The Geological History of Mount Kenya,'' The Quarterly journal of the Geological Society of London, Volume 56, 1900, pp. 219-220〕 Kenyte has also been reported from Mount Kilimanjaro and Mount Erebus in Antarctica.〔Kyle, Philip R., ed., ''Volcanological and Environmental Studies of Mount Erebus, Antarctica,'' American Geophysical Union (December 1994), p. ''xi'' ISBN 978-0-87590-875-5〕
Kenyte has a glassy texture and may be composed of devitrified glass, which contains large phenocrysts of anorthoclase feldspar.〔(【引用サイトリンク】url=http://www1.newark.ohio-state.edu/Professional/OSU/Faculty/jstjohn/Volcano%20stuff/Mt.-Kenya.htm )
==References==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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