Siderite

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Siderite \Sid"er*ite\, n. [L. sideritis loadstone, Gr. ????,
     ????, of iron, from ???? iron.]
     1. (Min.)
        (a) 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}.
        (b) A meteorite consisting solely of metallic iron.
        (c) An indigo-blue variety of quartz.
        (d) Formerly, magnetic iron ore, or loadstone.
            [1913 Webster]
  
     2. (Bot.) Any plant of the genus {Sideritis}; ironwort.
        [1913 Webster] Siderographic

From WordNet (r) 2.0 [wn]:

  siderite
       n 1: iron ore in the form of ferrous carbonate [syn: {chalybite}]
       2: a meteorite consisting principally of nickel and iron