psilomelane 的定义
- a common mineral consisting of a mixture of pyrolusite and other oxides of manganese, usually found in black, rounded masses: an ore of manganese.
更多psilomelane例句
- Manganese occurs mainly as black oxide (MnO2) in the mineral pyrolusite; and, in a less pure form, in psilomelane and wad.
- As an ore of manganese it is much less abundant than pyrolusite or psilomelane.