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Manganite

Manganite is a mineral composed primarily of manganese oxide-hydroxide (MnOOH), along with small amounts of iron, aluminum, and other elements. It was first described in 1827 for an occurrence in the Harz Mountains, Saxony, Germany. The name is derived from its content of manganese.

Manganite forms under oxidizing conditions in hydrothermal deposits and as a weathering product of manganese-bearing minerals. It is a valuable ore of manganese, which is primarily used in steel production to improve hardness, stiffness, and strength.

In terms of appearance, manganite is typically dark gray to black, and forms in prismatic crystals with a sub-metallic to earthy luster. It has a Mohs hardness of about 4, meaning it is relatively soft and can be scratched by a knife.

Manganite is an interesting mineral for collectors, especially in its crystalline form, which displays distinct, deeply striated prismatic crystals that are usually grouped together.

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