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d32ogoqmya1dw8.cloudfront.net...Dexter Perkins (Univ. N. To improve our classrooms, we: ... All minerals that form crystals in the cubic system appear isotropic when viewed under

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Page 1: d32ogoqmya1dw8.cloudfront.net...Dexter Perkins (Univ. N. To improve our classrooms, we: ... All minerals that form crystals in the cubic system appear isotropic when viewed under