marcasite

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mar·ca·site

 (mär′kə-sīt′, -zīt′)
n.
1. A mineral with the same composition as pyrite, FeS2, but differing in crystal structure. Also called white iron pyrites.
2. An ornament of pyrite, polished steel, or white metal.

[Middle English, from Medieval Latin marcasīta, from Arabic marqašīṯā, from Aramaic marqəšitā, from Akkadian marḫašu, from marḫaši, ancient region in the eastern Iranian plateau.]

mar′ca·sit′i·cal (-sĭt′ĭ-kəl) adj.
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.

marcasite

(ˈmɑːkəˌsaɪt)
n
1. (Minerals) a metallic pale yellow mineral consisting of iron sulphide in orthorhombic crystalline form used in jewellery. Formula: FeS2
2. (Jewellery) a cut and polished form of steel or any white metal used for making jewellery
[C15: from Medieval Latin marcasīta, from Arabic marqashītā, perhaps from Persian]
marcasitical adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

mar•ca•site

(ˈmɑr kəˌsaɪt)

n.
1. a common mineral, iron sulfide, FeS2, chemically identical to pyrite but crystallizing in the orthorhombic system.
2.
a. a crystallized form of this, used for jewelry.
b. any mineral resembling this form or any substance imitating it, esp. as used in jewelry.
[1375–1425; < Medieval Latin marcasīta < Arabic < Aramaic]
mar`ca•sit′i•cal (-ˈsɪt ɪ kəl) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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