Psilomelane
（重定向自Black hematite）
![](/Images/godic/202412/24/Mineraly.sk_-_psilomelan2048.jpg")
![Dendritic psilomelane on a cobble](/Images/godic/202412/24/Psilomelane-dendrites2048.jpg")
![Polished specimen of manganese ore from the Batesville, Arkansas district. Slab of manganese ore showing an intimate mixture of hausmannite and psilomelane in a roughly zonal arrangement and a radiating mass of white barite at the center. The light steel-gray mineral and the black mineral immediately adjacent to the barite are psilomelane. The rest of the black mineral is hausmannite. Natural size.](/Images/godic/202412/24/Psilomelane+Hausmanite2048.jpg")
Psilomelane is a group name for hard black manganese oxides including hollandite and romanechite. Psilomelane consists of hydrous manganese oxide with variable amounts of barium and potassium. Psilomelane is erroneously, and uncommonly, known as black hematite, despite not being related to true hematite, which is an iron oxide.