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KCON claim, USA-4, Clarion-Clipperton Zone, 13°N 127°W, Pacific Ocean
© Antonio Borrelli
| Colour: | Black, bluish, brownish ... | Hardness: | 1 - 6½ |
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A generic name for (often poorly crystalline) soft manganese oxides/hydroxides, often containing significant amounts of hydroxides/oxides of other metals and adsorbed metals (iron and other transition metals, alkali elements, etc.) See also Manganese Oxides. | |||