1) Manganese mineral 2) Mineral
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https://www.crosswordclues.com/clue/pyrolusite
Pyrolusite is a mineral consisting essentially of manganese dioxide (MnO2) and is important as an ore of manganese. It is a black, amorphous appearing mineral, often with a granular, fibrous or columnar structure, sometimes forming reniform crusts. It has a metallic luster, a black or bluish-black streak, and readily soils the fingers. The specifi...
Found on
http://en.wikipedia.org/wiki/Pyrolusite
• (n.) Manganese dioxide, a mineral of an iron-black or dark steel-gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name).
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http://thinkexist.com/dictionary/meaning/pyrolusite/
common manganese mineral, manganese dioxide (MnO2), that constitutes an important ore. Always formed under highly oxidizing conditions, it forms ... [1 related articles]
Found on
http://www.britannica.com/eb/a-z/p/138
Pyr`o·lu'site noun [
Pyro- + Greek ... to loose, or ... a loosing.]
(Min.) Manganese dioxide, a mineral of an iron-black or dark steel-gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tin...
Found on
http://www.encyclo.co.uk/webster/P/204
Pyrolusite is an oxide of manganese of the rutile group with the formulae MnO2 and a relative hardness of 3. It is the major ore of manganese which is used in the manufacture of steel. Pyrolusite is formed when manganese is dissolved out of crystalline rocks and then redeposited in dentrites etc. Pyrolusite was confirmed as a distinct species of mi...
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http://www.probertencyclopaedia.com/browse/HP.HTM
[
n] - a mineral consisting of manganese dioxide
Found on
http://www.webdictionary.co.uk/definition.php?query=pyrolusite
noun a mineral consisting of manganese dioxide; an important source of manganese
Found on
https://www.encyclo.co.uk/local/20974
a common mineral, manganese dioxide, MnO, the principal ore of manganese, used in various manufactures, as a decolorizer of brown or green tints in glass, and as a depolarizer in dry-cell batteries.
Found on
https://www.infoplease.com/dictionary/pyrolusite
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