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Wikipedia definition
1. Shocked quartzShocked quartz is a form of quartz that has a microscopic structure that is different from normal quartz. Under intense pressure (but limited temperature), the crystalline structure of quartz will be deformed along planes inside the crystal. These planes, which show up as lines under a microscope, are called planar deformation features (PDFs), or shock lamellae.
Read “Shocked quartz” on English Wikipedia
Read “衝撃石英” on Japanese Wikipedia
Read “Shocked quartz” on DBpedia

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