Definitions

from The Century Dictionary.

  • noun A borate containing magnesium and manganese (formula perhaps 3MgB2O4.MnMn2O4), occurring in black tabular orthorhombic crystals: found in Sweden.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy A monoclinic-prismatic black mineral containing boron, magnesium, manganese, and oxygen.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

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