Growth flawing and strain in hydrothermal quartz

Abstract With the aid of optical methods (including interphako microscopy) combined with chemical analysis at selected microareas (X‐ray microprobe analyser) it is shown that some macro‐defects arise during the growth of quartz single crystals due to the incorporation of foreign particles which are gathered in groups. Frequently, the strain in such crystals is inherited from the seeds. Therefore, the emphasis is laid on the optical investigation of strain in quartz.