Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. A soft, black to dark gray mineral, MnO2, the commonest and most important secondary ore of manganese.
Century Dictionary and Cyclopedia
- n. Native manganese dioxid (MnO2), a common ore of manganese, occurring crystallized and massive, of a gray-color and metallic luster. It parts with a portion of its oxygen at a red heat, and is on this account used to discharge the brown or green tints of glass, whence its name. When crystallized it has often the form of manganite, from which it has been, at least in manycases, derived by alteration. It is very soft, and is readily distinguished by this property from the other form of manganese dioxid, called polianite.
Wiktionary
- n. mineralogy A dark coloured mineral, consisting of manganese dioxide (MnO2), that is an important ore of manganese.
GNU Webster's 1913
- n. (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 tints of glass (whence its name).
WordNet 3.0
- n. a mineral consisting of manganese dioxide; an important source of manganese
Etymologies
- German Pyrolusit : Greek puro-, pyro- + Greek lousis, a washing (from louein, to wash; see leu(ə)- in Indo-European roots). (American Heritage® Dictionary of the English Language, Fourth Edition)
Examples
“The heat and carbon in the charcoal separated oxygen from the pyrolusite, leaving a metallic manganese residue.”
“The most important mineral is pyrolusite, because it is the main ore mineral for manganese.”
“In 1774, while heating the mineral pyrolusite (MnO2, manganese dioxide) in a charcoal fire, the Swedish scientist Johann Gahn discovered manganese.”
“Traces of pyrolusite in a chunk of raw glass, the result of a failure to produce colorless glass at Sagalassos”
“One special find this week was a chunk of raw glass, showing an unhomogeneous color, probably as a result of an insufficient or failed addition of decolorant in a reduced furnace atmosphere (e.g. manganese in the form of the mineral pyrolusite).”
“~ While studying the action of hydrochloric acid upon the mineral pyrolusite, in 1774, Scheele obtained a yellowish, gaseous substance to which he gave a name in keeping with the phlogiston theory then current.”
“How does pyrolusite effect the decolorizing of glass containing iron?”
“~ Manganese is found in nature chiefly as the dioxide MnO_ {2}, called pyrolusite.”
“_ In the laboratory chlorine is made by warming the mineral pyrolusite (manganese dioxide, MnO_ {2}) with concentrated hydrochloric acid.”
“The periodic process depends on the interaction between manganese dioxide (pyrolusite), sulphuric acid, and a bromide, and the operation is carried out in sandstone stills heated to 60°”
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"
Lists
These user-created lists contain the word ‘pyrolusite’.
-
steel
a reflection on :
Indo-European root stāk- to stand, place
stay, steel, style, temper, celesta, elinvar, vanadium steel, koftgari, mild steel, stale, falchion, eutectoid steel and 46 more...
Tweets
Looking for tweets for pyrolusite.
Comments
No comments yet...
Log in or sign up to get involved in the conversation. It's quick and easy.