-
Manganese is a
chemical element; it has
symbol Mn and
atomic number 25. It is a hard, brittle,
silvery metal,
often found in
minerals in
combination with...
- is a
group name for hard
black manganese oxides including hollandite and romanechite.
Psilomelane consists of
hydrous manganese oxide with
variable amounts...
-
mineral consisting essentially of
manganese dioxide (MnO2) and is
important as an ore of
manganese. It is a
black,
amorphous appearing mineral, often...
-
Manganese dioxide is the
inorganic compound with the
formula MnO 2. This
blackish or
brown solid occurs naturally as the
mineral pyrolusite,
which is...
-
Manganese violet is the
inorganic compound with the
formula NH4MnP2O7. As
implied by its name and composition, it is a purple,
inorganic pigment. Because...
-
often missing their skin layer, the
white ash layer) was
painted with
black manganese giving their color. The red
mummy technique (2500 BCE to 2000 BCE)...
- nodules, also
called manganese nodules, are
mineral concretions on the sea
bottom formed of
concentric layers of iron and
manganese hydroxides around a...
- were red (iron oxide, hematite, or red ochre) and
black (
manganese dioxide, pyrolusite),
though black from
juniper or pine
carbons has also been discovered...
- style. The
colors used by the cave
dwellers were
prepared by
combining black manganese oxides, red
hematite and charcoal. One rock, po****rly
referred to...
-
Rhodonite is a
manganese inosilicate, with the
formula (Mn, Fe, Mg, Ca)SiO3, and
member of the
pyroxenoid group of minerals,
crystallizing in the triclinic...