| 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. |