Explanation

Broadly defined as finely dispersed multi mineral aggregates; Narrowly defined as a mineral species. Commonly defined as a collection of oxides and hydroxides containing multiple elements of manganese. Becoming bell shaped, grape shaped, or kidney shaped. Black. Stripes brown to brownish black. Mohs hardness 46, density 4.4-4.7g/cm3. It is a typical epigenetic mineral formed by weathering of manganese carbonate or silicate. Symbiosis with pyroIusite. It can also be lumpy or nodular in marine lake phase sediments, and is an important raw mineral material for manganese extraction.

Classification