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Full text of 29th Forum on the Geology of Industrial Minerals proceedings, Long Beach, California, April 25-30, 1993 See other formats ...
Some intrusive rocks, very near the surface, grade into extrusive types. Those that cool deeper are more coarsely crystalline. G r a n i te is the best known of the deeper igneous plutonic rocks. It is usually light-colored, formed mainly of potash feldspar about 60 per cent and quartz about 30 per cent, usually with mica or hornblende.
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