The last was a piece of black manganese dioxide.

The paintings were drawn in black manganese oxide bound by animal grease.

The Ram slanted down, grounded on a ripple surface of black manganese pebbles.

Psilomelane is a group name for hard black manganese oxides including hollandite and romanechite.

On 12 June, a trench they were digging exposed black manganese sand mixed with bluish-gray quartz, and gold.

The small lump of black manganese dioxide held a piece of the spirit of everyone in the entire Clan, not just her clan.

Further, the bodies were found to be painted with red ocher while the heads were painted with black manganese.

In places, secondary white calcites together with black manganese oxides have been deposited in vanes and irregular spaces.

Wad is an old mining term for any black manganese oxide or hydroxide mineral-rich rock in the oxidized zone of various ore deposits.

Oxidation products including malachite, azurite, chrysocolla and black manganese stain occur widespread as fracture coatings throughout the mineralized zones.

Then the skin (or, in the case of children, who were often missing their skin layer, the white ash layer) was painted with black manganese giving their color.

But she was a medicine woman, and a piece of everyone's spirit had been given to her with the piece of black manganese dioxide that she carried in her amulet.

Deposits associated with breakdown rocks: In the Jubilee tourist cave, there are areas of rock breakdown with interesting deposits of brown and black manganese minerals associated with white minerals.

The name comes from the Greek for hidden and black, in reference to the confusion and difficulty in recognition of the various black manganese oxide minerals referred to as psilomelane, the collective term for hard manganese oxides.

A. Renaissance glassmakers in Italy discovered that they could clarify glass, naturally green or brown depending on how much iron was in the sand it was made from, by adding certain minerals, notably black manganese oxide, or manganese dioxide.