Economic and Environmental Geology

Fig. 1.

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Fig. 1. Representative polarized microscope images of standard rock samples. The same spot was photographed in three modes: open nicole, cross nicole, and cross nicole equipped with a gypsum plate. OB: Olivine basalt; BA: Basaltic andesite, OT: Olivine tholeiite; TOB: Trachytic olivine basalt.
Econ. Environ. Geol. 2022;55:309-16
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