Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An ore of iron, FeCO3.
  • noun A meteorite consisting mainly of iron and nickel.

from The Century Dictionary.

  • noun A meteorite consisting essentially of nickeliferous metallic iron. See meteorite.
  • noun The lodestone.
  • noun Native iron protocarbonate, a mineral of a yellowish or brownish color, crystallizing in the rhombohedral system with perfect rhombohedral cleavage.

from the GNU version of the Collaborative International Dictionary of English.

  • noun Carbonate of iron, an important ore of iron occuring generally in cleavable masses, but also in rhombohedral crystals. It is of a light yellowish brown color. Called also sparry iron, spathic iron.
  • noun A meteorite consisting solely of metallic iron.
  • noun An indigo-blue variety of quartz.
  • noun Formerly, magnetic iron ore, or loadstone.
  • noun (Bot.) Any plant of the genus Sideritis; ironwort.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun uncountable, mineralogy a widespread brown mineral, FeCO3, having the structure of calcite
  • noun countable an iron meteorite
  • noun An indigo-blue variety of quartz.
  • noun obsolete magnetic iron ore; lodestone

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun iron ore in the form of ferrous carbonate
  • noun a meteorite consisting principally of nickel and iron

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Latin sideritis ("lodestone"), from Ancient Greek, of iron, from iron.

Examples

  • “Many people have assumed that the hematite in ancient rocks formed by the oxidation of siderite in the modern atmosphere,” said Hiroshi Ohmoto, professor of geochemistry, Penn State.

    Deep-sea Rocks Point To Early Oxygen On Earth | Impact Lab

  • “If hematite were formed by the oxidation of siderite at any time, the hematite would be found on the outside of the siderite, but it is found inside,” he reported in a recent issue of Nature Geoscience.

    Deep-sea Rocks Point To Early Oxygen On Earth | Impact Lab

  • The article also includes the first ever figure of the specimen, showing it in its unprepared, siderite-encased case (a scan of that figure is included here).

    Archive 2006-07-01

  • The article also includes the first ever figure of the specimen, showing it in its unprepared, siderite-encased case (a scan of that figure is included here).

    ‘Angloposeidon’, the unreported story, part IV

  • Any automaton was sure to register her as a siderite, and ignore her.

    Agent Of The Terran Empire

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

    An Elementary Study of Chemistry

  • Among these are barite or heavy spar (BaSO4), used as a pigment, which is found in the strata of the Kirtland shale; siderite or brown spar

    Tseh So, a Small House Ruin, Chaco Canyon, New Mexico :

  • English ores also contain considerable iron carbonate or siderite.

    The Economic Aspect of Geology

  • Iron likewise combines with a considerable variety of substances other than oxygen; and some of these compounds, as for instance iron carbonate (siderite), iron silicate (chamosite, glauconite, etc.), and iron sulphide (pyrite), are locally mined as iron ores.

    The Economic Aspect of Geology

  • The original condition is indicated by the facts that deep below the surface, in zones protected from weathering solutions, siderite and greenalite are abundant, and that they show complete gradation to hematite in approaching the surface.

    The Economic Aspect of Geology

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