fig17
![Recent advances in the marketing, impurity characterization and purification of quartz](https://image.oaes.cc/036f0845-0107-47fd-9d89-518c1048755f/mmm2017.fig.17.jpg)
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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