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In this four-part exercise, students look at mafic igneous minerals, learning to distinguish and identify them in hand specimen and thin section. Part one - Box of Rocks: Students examine a tray of minerals and record their physical properties, composition, and habit. They note chemical and physical similarities and differences and why there are several varieties of minerals in each group. Part two - Observing Optical Properties: Students learn how to use a microscope to observe thin sections. Part three - Defining optical microscopy and light ray terms Part four - Answer questions using thin sections
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