Hard quartz
Crossword Clue

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AnswerCrossword Clue
FLINTHard quartz
FLINTHard quartz.
FLINTSHard pieces of quartz.
polianitemanganese dioxide, occurring in tetragonal crystals nearly as hard as quartz
polianitesPOLIANITE, manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz
flinta massive hard dark quartz that produces a spark when struck by steel
novaculiteA hard, dense, fine-grained siliceous rock resembling chert, with a high content of microcrystalline quartz
quartziteAn extremely compact, hard, granular rock consisting essentially of quartz. It often occurs as silicified sandstone, as in sarsen stones
porcelaina hard, fine-grained, sonorous, nonporous, and usually translucent and white ceramic ware that consists essentially of kaolin, quartz, and a feldspathic rock and is fired at a high temperature called also hard-paste porcelain true porcelain