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Manganese specific gravity

and specific gravity of 4.75. It occurs as a pseudomorph of manganite or other manganese minerals, usually massive or reniform, in some examples with a fibrous and radiate structure. Psilomelane is similar to pyrolusite in colour and specific gravity, but it has a submetallic lustre and is much harder (5 to 6). It is amorphous and can be massive

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