Pyrolusite
Introduction: Pyrolusite was once used as an additive in glass making to remove brown and green tints. It derives from the Greekwords pyros, meaning 'fire' and louxo 'to wash'. It is found as minute, shiny black metallic crystals, or in solid layers.
Distribution: Common in the Kombat Mine and the Otjosondu manganese field.
Composition: Oxide
Crystal system: Tetragonal
Lustre: Dull, metallic
Streak: Black
Hardness: 2-6.5
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