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A thin section of a volcanic sand grain seen under the microscope, with plane-polarized light in the upper picture, and cross-polarized light in the l
A thin section of a volcanic sand grain seen under the microscope, with plane-polarized light in the upper picture, and cross-polarized light in the lower picture. Scale box is 0.25 mm.
Ljudmila Dolar Mantuani (1906–1988), first female professor of petrography in Yugoslavia
Ljudmila Dolar Mantuani (1906–1988), first female professor of petrography in Yugoslavia
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Solidified lava flow in Hawaii
Solidified lava flow in Hawaii
Sedimentary layers in Badlands National Park, South Dakota
Sedimentary layers in Badlands National Park, South Dakota
Metamorphic rock, Nunavut, Canada
Metamorphic rock, Nunavut, Canada
Native gold from Venezuela
Native gold from Venezuela