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The purpose of this exercise is to: become familiar with the various types of zoning found to occur in plagioclase feldspars, be able to recognize and identify the various zoning types, and be able to interpret the petrogenesis of the various zoning types from optical and microprobe data. Additionally, the exercise is to give the student an opportunity to interpret analytical data and to engage in critical thinking as it relates to igneous petrology of volcanic rocks.
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