psilomelane
/ˌsʌɪlə(ʊ)məˈleɪn/Mineralogy
noun
A hard black ore of manganese which consists of a mechanical mixture of manganese oxides and hydroxides, usually also containing barium and other metals.
Origin
Mid 19th century. From psilo- + ancient Greek μέλαν, neuter of μέλας black, after German Psilomelan, itself apparently after schwarzer Glaskopf.
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