fig17
Figure 17. (A) and (B) SEM images of quartz minerals before and after physical purification, respectively; (C) and (D) EDS images of residual impurities. EDS: Energy dispersive spectrometer; SEM: scanning electron microscopy.
Figure 17. (A) and (B) SEM images of quartz minerals before and after physical purification, respectively; (C) and (D) EDS images of residual impurities. EDS: Energy dispersive spectrometer; SEM: scanning electron microscopy.
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