- 1. n. Manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz. Source: opted
- 2. Manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz. Source: webster
- 3. Manganese dioxide, occurring in tetragonal crystals nearly ashard as quartz. Source: adambom
- 4. n. Manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz. Source: ecdict
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