BAN
发表于 2025-3-28 18:11:07
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Supplement
发表于 2025-3-28 22:18:42
ng after mastering the strike and dip of rock surfaces with the Brunton compass, many geology students are able to determine precisely the identity of quartz, or the anorthite content of plagioclase, or the magne sium ratio of pyroxene with the polarizing or petrographic microscope, by means of mea