• synonyms


  1. Also called chalybite. a common mineral, iron carbonate, FeCO3, usually occurring in yellowish to deep-brown cleavable masses: a minor ore of iron.
  2. a meteorite consisting almost entirely of metallic minerals.
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Origin of siderite

1570–80, in sense “loadstone”; 1845–50 for def 1; sider- + -ite1; in obsolete sense, variant of siderites < Latin sidērītēs < Greek sidērī́tēs loadstone
Related formssid·er·it·ic [sid-uh-rit-ik] /ˌsɪd əˈrɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for siderite

Historical Examples of siderite

  • This compound occurs in nature as siderite, and is a valuable ore.

    An Elementary Study of Chemistry

    William McPherson

  • Siderite, or spathic iron ore, FeCO3, crystallizes in the rhombohedral system and contains 48.28% of iron.

  • Their principal iron mineral is hematite, although the English ores also contain considerable iron carbonate or siderite.

  • The Bilbao ores consist mainly of siderite, which near the surface has altered to large bodies of oxide minerals.

  • Quartzite (instead of limestone) is an unusual locus of replacement ores, and siderite is an unusual gangue.

British Dictionary definitions for siderite


  1. Also called: chalybite a pale yellow to brownish-black mineral consisting chiefly of iron carbonate in hexagonal crystalline form. It occurs mainly in ore veins and sedimentary rocks and is an important source of iron. Formula: FeCO 3
  2. a meteorite consisting principally of metallic iron
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Derived Formssideritic (ˌsaɪdəˈrɪtɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012