Phengite is a series name for dioctahedral micas of composition K(AlMg)2(OH)2(SiAl)4O10, similar to muscovite but with addition of magnesium. It is a non-IMA recognized mineral name representing the series between muscovite and celadonite. The silica content of phengite has been proposed as a geobarometer for the metamorphism of low grade schists....
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http://en.wikipedia.org/wiki/Phengite
bright and beautiful kind of alabaster
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http://phrontistery.info/p.html
(from the article `Earth Sciences`) ...contained about 1% water stored in the mineral biotite. As pressure on the sediment was increased to correspond to depths of 70–80 km (45–50 mi), ...
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http://www.britannica.com/eb/a-z/p/55
phengite A beautiful species or kind of alabaster, superior in brightness to most species of marbles.
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http://www.wordinfo.info/words/index/info/view_unit/1635/
No exact match found.
