igneous rocks lack _____
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Some amphiboles may also crystallize before the melt is used up. Mafic melts don't have enough silica to crystallize potassium feldspar, quartz, etc. Felsic melts don't have enough iron, magnesium, and calcium to form olivine, pyroxene, or calcium plagioclase.
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Some amphiboles may also crystallize before the melt is used up. Mafic melts don't have enough silica to crystallize potassium feldspar, quartz, etc. Felsic melts don't have enough iron, magnesium, and calcium to form olivine, pyroxene, or calcium plagioclase.
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