psilomelane

psilomelane
/suy lom"euh layn'/, n.
a common mineral consisting of a mixture of pyrolusite and other oxides of manganese, usually found in black, rounded masses: an ore of manganese.
[1825-35; < Gk psiló(s) bare, smooth + mélan, neut. of mélas black]

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Barium and manganese hydrous oxide, BaMnMn8O16(OH)4, an important ore mineral of manganese.

What was formerly called psilomelane is now known to be a mixture of several manganese oxides of which romanechite is a major constituent. Such manganese oxide mixtures may form large deposits and may occur in lake or swamp bedded deposits and clays; it has been found in Germany, France, Belgium, Scotland, Sweden, India, and the U.S. The name psilomelane (from the Greek words for "smooth" and "black") refers to its typical black, smooth-surfaced, grape-bunch-shaped or stalactitic masses.

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  • PSILOMÉLANE — Oxyde hydraté naturel de manganèse observé généralement en concrétions à structures en zones concentriques ou en agrégats microcristallins (les enduits dendritiques sont fréquents). Le psilomélane est noir à l’éclat submétallique. La dureté (4 6) …   Encyclopédie Universelle

  • Psilomelane — Psi*lom e*lane, n. [Gr. ? bare + ?, ?, black.] (Min.) A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron black or steel gray color. [1913 Webster] …   The Collaborative International Dictionary of English

  • Psilomelane — Infobox mineral name = Psilomelane category = boxwidth = boxbgcolor = caption = A native sample of psilomelane formula = The general formula Ba(Mn2+)(Mn4+)8O16(OH)4 or as (Ba,H2O)2Mn5O10 Barium Manganese Oxide Hydroxide molweight = 590.03 gm… …   Wikipedia

  • psilomelane — psilomelanas statusas T sritis chemija apibrėžtis Mineralas. formulė mMnO·MnO₂·nH₂O atitikmenys: angl. psilomelane rus. псиломелан …   Chemijos terminų aiškinamasis žodynas

  • psilomelane — noun Any hard, black hydrous manganese oxide with variable amounts of barium and potassium …   Wiktionary

  • psilomélane — (psi lo mé la n ) s. m. Sorte d oxyde de manganèse naturel …   Dictionnaire de la Langue Française d'Émile Littré

  • psilomelane — psi·lo·mel·ane …   English syllables

  • psilomelane — /saɪloʊˈmɛleɪn/ (say suyloh melayn) noun 1. a common mineral, a hydrated barium manganate, occurring in smooth, black to steel grey, botryoidal or stalactitic forms and in masses; an ore of manganese. 2. any hard massive manganese oxide. {Greek… …  

  • psilomelane — noun a mineral consisting of hydrated basic oxide of manganese and barium; a source of manganese • Hypernyms: ↑mineral • Substance Meronyms: ↑manganese, ↑Mn, ↑atomic number 25 …   Useful english dictionary

  • Manganese — Not to be confused with Magnesium. This article is about the chemical element. For the ghost town, see Manganese, Minnesota. For the steamship, see SS Manganese. chromium ← manganese → iron ↑ Mn ↓ Tc …   Wikipedia

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