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quartz [kwɔ:ts] abbr.
abbr. qtz
jewl. A very hard mineral composed of silica, found worldwide in many different types of rocks, including sandstone and granite. Types include amethyst, smokey quartz, tiger's eye quartz, rose quartz, among others. Chalcedony, another type, is a type of polysi
nautic., abbr. qrtz
quartz: 9 phrases in 4 subjects
Chemistry1
Earth sciences1
Environment6
Transport1