Romanechite: The mineral romanechite information and pictures

About

Romanechite is sometimes synonymous with Psilomelane, but in reality Romanechite is a strictly defined mineral that is recognized by the IMA, whereas Psilomelane is not specifically identified, or is a compound of several barium manganse oxides including Romanechite. Romanechite is named after the locality of Romanèche-Thorens in France, the type locality for this mineral.

Crystal Forms & Aggregates

Never in individual crystals. Habits include botryoidal, mammilary, reniform, stalactitic, radiating, acicular, fibrous, dendritic, arborescent, encrusting, massive, and earthy.

Striking Features

Color, streak, and association with other manganese minerals

Environment

As a secondary mineral in hydrothermal replacement deposits, in sandstones, limestones, and clays.

Uses

Romanechite is an ore of manganese.

Noteworthy Localities

Romanechite occurs in many manganese deposits, though most often in uninteresting habit and not necessarily identified. The type locality for Romanechite is Romanèche, Saône-et-Loire, France. Other important localities include the Clara Mine, Oberwolfach, Black Forest, Baden-Württemberg, Germany; the Adam Heber Mine, Neustädtel, Schneeberg, Saxony, Germany; and an unspecified locality in Pinal Co, Arizona which has recently been producing nice specimens.

Common Mineral Associations

Barite, Pyrolusite, Quartz, Hematite

Distinguishing Similar Minerals

Pyrolusite - Most commonly in crystallized aggregates, which are lacking in Psilomelane.
Hematite - Has a red streak.
Goethite - Yellow streak, lower specific gravity, usually a darker color.