| 单词 |
braunite |
| 释义 |
braunite Min.|ˈbraʊnaɪt| [Named after Mr. Braun of Gotha (Dana).] An anhydrous oxide of manganese, a brittle dark brownish-black mineral occurring both crystallized and massive.
1839Penny Cycl. XIV. 380/2 Braunite..before the blow⁓pipe melts and effervesces slightly with borax. 1869Roscoe Elem. Chem. 233 Manganese sesquioxide..occurs in nature as the mineral braunite. |

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