py·ro·lu·site

(pī′rō-lo͞o′sīt)

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).]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

pyrolusite

(ˌpaɪrəʊˈluːsaɪt)

(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]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

py•ro•lu•site

(ˌpaɪ rəˈlu saɪt, paɪˈrɒl yəˌsaɪt)

n.

a grayish black mineral, manganese dioxide, MnO₂, the principal ore of manganese.

[1820–30; pyro- + Greek loûs(is) washing + -ite¹]

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

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

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References in periodicals archive

The iron and manganese minerals in the study area were goethite, siderite, and rhodochrosite and contained a small amount of pyrite, magnetite, and pyrolusite [23].

Sources Identification of Nitrogen Using Major Ions and Isotopic Tracers in Shenyang, China

SAED intensity profile, plotted as a function of [d.sup.-1] ([nm.sup.-1]), of the sample Mn25 presents the typical peaks of both maghemite and jacobsite [28] and the presence of manganosite and pyrolusite influences the symmetry of the peaks at 4.9 [nm.sup.-1] and 6.6 [nm.sup.-1] [28].

Synthesis and Characterization of Mixed Iron-Manganese Oxide Nanoparticles and Their Application for Efficient Nickel Ion Removal from Aqueous Samples

Subsequently when the calcination temperature was further increased to 400[degrees]C the XRD spectra attained were in agreement with pyrolusite Mn[O.sub.2] (JCPDS number 24-0735).

Synthesis, Characterization, and Relative Study on the Catalytic Activity of Zinc Oxide Nanoparticles Doped MnC[O.sub.3], -Mn[O.sub.2], and -[Mn.sub.2][O.sub.3] Nanocomposites for Aerial Oxidation of Alcohols

Manganese is found as braunite, pyrolusite, psilomelane, and rhodochrosite.

Market Report, "Global Manganese Mining Market 2016-2020", published

Important minerals of manganese are pyrolusite manganite and hausmannite (Roberts et al.

Mineralogical characterization and evaluation of manganese ore from Bajaur Agency Khyber Pakhtunkwa Pakistan

More specifically, they suggested that since manganese does not occur free in nature, it must be present within teeth as a mineral such as pyrolusite (manganese dioxide) and psilomelane (an oxide mineral of manganese and barium), both of which are described as bluish-black with a metallic appearance.

The discolouration of human teeth from archaeological contexts: elemental analysis of a black tooth from a roman cranium recovered from the River Witham, Lincoln, UK

The standards selected for Mn were birnessite [([(Na, Ca).sub.0.5]([Mn.sup.4+], [Mn.sup.3+]).sub.2] [O.sub.4].1.5[H.sub.2]O), hureaulite ([(Mn, Fe).sub.5][H.sub.2][(P[O.sub.4]).sub.4].4[H.sub.2]O), manganocalcite (Mn-CaC[O.sub.3]), Mn-carbonate (MnC[O.sub.3]), Mn-sulfate (MnS[O.sub.4]), bixbyite ([Mn.sub.2][O.sub.3]), pyrolusite (Mn[O.sub.2]), and switzerite ([(Mn, Fe).sub.3][(P[O.sub.4]).sub.2].7[H.sub.2]O).

Characterising the chemistry of micropores in a sodic soil with strong texture-contrast using synchrotron x-ray techniques and LA-ICP-MS

Pyrolusite has been used for adsorption of Pb, Zn and Mg ions from their aqueous solution [39].

Lead Removal from Water by Low Cost Adsorbents: A Review

The data points plot well within the [Mn.sup.2+] stability field, indicating that Mn is very undersaturated relative to pyrolusite (Mn[O.sub.2]; Mn concentrations are much lower than [10.sup.-6] M), and is not likely to become saturated unless highly oxidizing conditions are encountered.

A model for uranium mobility in groundwater in the Grand Pre region, Nova Scotia, Canada