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Related to pyrolusite: pyrrhotite, psilomelane


A soft, black to dark gray mineral, MnO2, the commonest and most important secondary ore of manganese.

[German Pyrolusit : Greek puro-, pyro- + Greek lousis, a washing (from louein, to wash; see leu(ə)- in Indo-European roots).]


(Minerals) a blackish fibrous or soft powdery mineral consisting of manganese dioxide in tetragonal crystalline form. It occurs in association with other manganese ores and is an important source of manganese. Formula: MnO2
[C19: from pyro- + Greek lousis a washing +-ite1, from its use in purifying glass]


(ˌpaɪ rəˈlu saɪt, paɪˈrɒl yəˌsaɪt)

a grayish black mineral, manganese dioxide, MnO2, the principal ore of manganese.
[1820–30; pyro- + Greek loûs(is) washing + -ite1]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pyrolusite - a mineral consisting of manganese dioxide; an important source of manganese
atomic number 25, manganese, Mn - a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
References in periodicals archive ?
Important minerals of manganese are pyrolusite manganite and hausmannite (Roberts et al.
Pyrolusite has been used for adsorption of Pb, Zn and Mg ions from their aqueous solution [39].
2+] stability field, indicating that Mn is very undersaturated relative to pyrolusite (Mn[O.
Rarely, the district has also provided good specimens of hausmannite, pyrolusite, pseudomorphs of hausmannite after manganite, and pseudomorphs of pyrolusite after calcite--but it is almost entirely to its wonderful manganite specimens that Ilfeld owes its fame in the world of mineral collecting.
Munsar & Kandri Braunite, Jacobsite, Pyrolusite Psilomelane, Hematite Quartz and Apatite.
In relation to the Flores project, the areas contain extensive alluvial and landslide deposits and are highly prospective for nearby in-situ primary manganese deposits, with a site visit confirming the presence of large boulders containing massive pyrolusite which would be expected to return very high manganese grades.
Within the oxidized zones, the primary sulfide minerals were commonly converted to limonite, pyrolusite, cerussite, anglesite, argentojarosite and plumbojarosite (basic sulfates of Fe), and native silver, with traces of malachite and azurite.
Mineral (%) Los Cortijo de Morron de Trancos Archidona Mateo (1) Smectite 97 [+ or -] 2 92 [+ or -] 4 72 [+ or -] 11 Cristobalite 1 [+ or -] 1 2 [+ or -] 1 6 [+ or -] 4 Quartz 1 [+ or -] 1 2 [+ or -] 1 3 [+ or -] 2 Plagioclase 7 [+ or -] 1 3 [+ or -] 1 9 [+ or -] 4 Calcite Traces 2 [+ or -] 2 4 [+ or -] 4 Biotite Traces 1 [+ or -] 1 Traces (1) Also different quantities of pyroxenes, amphiboles, K-feldspars, zeolites and pyrolusite Table 2.
Manganese minerals predominate over iron (hematite) and include pyrolusite, psilomelane/cryptomelane, hausmanite, and braunite.
Being an etymologist she searches for herself in dictionaries and relishes the "lovely words: pyrolusite, ignimbrite, omphacite, uvarovite, glaucophane, schist, shale, gneiss, tuff.
Manganese is more difficult to remove than iron, oxidizing more slowly and requiring longer detention in the basin and sometimes a special precipitant, or prefiltration through a coke or pyrolusite contact filter, before sand filtration.