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![quartz crystal sample [?] in a stoppered glass tube](/internal/media/dispatcher/20001/resize%3Aformat%3Dthumbnail;jsessionid=9BC4295567628E57AD0C5189493F574E)
![quartz crystal sample [?] in a stoppered glass tube](/internal/media/dispatcher/20002/resize%3Aformat%3Dthumbnail;jsessionid=9BC4295567628E57AD0C5189493F574E)
