what is the meaning of acid igneous rocks
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The acidic igneous rocks (commonly referred to as “acid” rocks and rarely as acidites) comprise those rocks, whatever their origin and whatever level of the crust in which they crystallize, that are sufficiently silica-rich to contain modal (actual) or normative (theoretical) quartz in quantities of about 10% or more.
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The acidic igneous rocks (commonly referred to as “acid” rocks and rarely as acidites) comprise those rocks, whatever their origin and whatever level of the crust in which they crystallize, that are sufficiently silica-rich to contain modal (actual) or normative (theoretical) quartz in quantities of about 10% or more.
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