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University of Bristol, Uk: Minerals Under the Microscope
In this geology course, students learn about the use of the polarizing microscope, the primary tool for examining the structure of mineral samples such as cleavage, density, fracture, color, and the like.
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Mineralogical Society of America: Mineral Identification Key: Mineral Properties
Scientists classify minerals based on a set of physical properties. Each of these properties is described in detail.