Definitions
from The Century Dictionary.
- noun Manganese hydrate, a mineral occurring in foliated forms with pearly luster, resembling brucite. It is white when fresh, but changes to bronze and black upon exposure.
 
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy  A trigonal-hexagonal scalenohedral 
mineral containinghydrogen ,manganese , andoxygen . 
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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