psilomelane

psi·lom·e·lane

 (sī-lŏm′ə-lān′)

n.

A mixture of black manganese oxide minerals.

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[Greek psīlos, bare + Greek melās, melan-, black.]

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.

psilomelane

(sɪˈlɒmɪˌleɪn)

n

(Minerals) a common black to grey secondary mineral consisting of hydrated basic oxide of manganese and barium: a source of manganese. Formula: BaMn9O16(OH)4. Also called: romanicite

[C19: from Greek psilos bare + melas black]

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

Thesaurus

Noun

1.

psilomelane - a mineral consisting of hydrated basic oxide of manganese and barium; a 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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