| hausmannite | |
noun | |
| a mineral consisting of manganese tetroxide; a source of manganese |
:10
:09
:08
:07
:06
:05
:04
:03
:02
:01
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
hausmannite
a manganese oxide mineral (Mn2+Mn3+2O4) that occurs as brownish black crystals or granular masses in high-temperature hydrothermal veins and in contact metamorphic zones. It is found associated with other oxide minerals of manganese and other metals at Ilmenau, Ger.; Langban, Swed.; and Batesville, Ark., U.S. For detailed physical properties, see oxide mineral (table)
Learn more about hausmannite with a free trial on Britannica.com.