Pyrolusite is a mineral consisting essentially of manganese dioxide (Mn O 2) and is important as an ore of manganese. [7] It is a black, amorphous appearing mineral, often with a granular, …

pyrolusite, common manganese mineral, manganese dioxide (MnO 2), that constitutes an important ore.

Usually found as matte-black powdery to fibrous crusts, sometimes in botryoidal aggregates or columnar, more rarely as druzes of small prismatic to tabular, dark grey metallic crystals. May …

Pyrolusite is the most common manganese mineral. It is one of several manganese oxide minerals, which are all dark gray to black in color and may be very difficult to distinguish from …

Pyrolusite is a mineral composed primarily of manganese dioxide (MnO₂). It is considered the most important and common ore of manganese, meaning it is the principal mineral from which …

From the Greek, pyro and louein, "fire" and "to wash," because it was used to remove the greenish color imparted to glass by iron compounds. Comments: Steel-gray metallic prismatic …

Pyrolusite is one of about two or three dozen blackish-colored manganese oxide or hydroxy-oxide minerals. Distinguishing pyrolusite (MnO2 - manganese dioxide) from other Mn-oxides …

Pyrolusite forms as a weathering product of other manganese minerals, as concretions or dendrites deposited by ground water or as nodules precipitated from lake water. Pyrolusite is …

PYROLUSITE Mn4+O2 4. x 6 cm. A. E. Seaman Mineral Museum specimen No. GBR 2639, Jeffrey Scovi e minerals. It occurs in bog and lake manganese ores as well as in marine …

Pyrolusite is a mineral consisting essentially of manganese dioxide (MnO2) and is important as an ore of manganese. It is a black, amorphous appearing mineral, often with a granular, fibrous, …