One of the oxides of manganese; -- called also gray manganese ore. It occurs in brilliant steel-gray or iron-black crystals, also massive.
oewn 2023
0% interchangeable
Open English WordNet identifies the related term as a containing group, substance or whole.
A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color.
oewn 2023
0% interchangeable
Open English WordNet identifies the related term as a containing group, substance or whole.
Manganese dioxide, a mineral of an iron-black or dark steel-gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red h…
oewn 2023
0% interchangeable
Open English WordNet identifies the related term as a containing group, substance or whole.
Manganese carbonate, a rose-red mineral sometimes occuring crystallized, but generally massive with rhombohedral cleavage like calcite; -- called als…
oewn 2023
0% interchangeable
Open English WordNet identifies the related term as a containing group, substance or whole.