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Pyrolusite is a
mineral consisting essentially of
manganese dioxide (MnO2) and is
important as an ore of manganese. It is a black,
amorphous appearing...
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investigated barium in
pyrolusite:
Scheele (1774). "Om brunsten,
eller magnesia, och dess egenskaper" [On brown-stone [i.e.,
pyrolusite] or magnesia, and its...
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formula MnO 2. This
blackish or
brown solid occurs naturally as the
mineral pyrolusite,
which is the main ore of
manganese and a
component of
manganese nodules...
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under the same
conditions and
having the same
commercial applications as
pyrolusite. It is
found at many localities;
amongst those which have
yielded typical...
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aquarium fish. In 1659,
Johann Rudolf Glauber fused a
mixture of the
mineral pyrolusite (manganese dioxide, MnO2) and pot****ium
carbonate to
obtain a material...
- chert,
producing conchoidal fracture.
Dendritic manganese oxides such as
pyrolusite and/or iron
oxides such as
limonite may
precipitate along rock crevices...
- discovery.
Scheele produced chlorine by
reacting MnO2 (as the
mineral pyrolusite) with HCl: 4 HCl + MnO2 → MnCl2 + 2 H2O + Cl2
Scheele observed several...
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nature but far
rarer in
synthetic chemistry. The most
common Mn ore,
pyrolusite, is MnO2. It is the dark
brown pigment of many cave
drawings but is also...
- are red, orange, or yellow,
black gossans from
manganese oxides such as
pyrolusite, manganite, and
especially psilomelane form at the
oxidized portion of...
- is used as flux for
blast furnaces,
while others such as wolframite,
pyrolusite, and
chromite are used in
making ferrous alloys.
Important non-ferrous...
