manganese dioxide occurring in tetragonal crystals nearly as hard as quartz
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AnswerCrossword Clue
polianitemanganese dioxide, occurring in tetragonal crystals nearly as hard as quartz
polianitesPOLIANITE, manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz
anatasesOne of the tetragonal forms of titanium dioxide, usually found as brown crystals, used as a pigment in paints and inks