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In order for a rock to be classified as felsic, it generally needs to

Gem Formation- Good Pictures,bwsmigelinfo - silicon dioxide changes basalt color ,GEOLOGY 115 LESSON 10: GEM FORMATION Before venturing into a summary of the ways in which gems are formed, it would be good background to review where those .Magmatic Differentiation - Tulane UniversityInitially, researchers attempted to show that one or the other of these process acted exclusively to cause magmatic differentiation With historical perspective, we ..



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In order for a rock to be classified as felsic, it generally needs to contain more than 75% felsic minerals; namely quartz, orthoclase and plagioclase..

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