Hypertext Webster Gateway: "siderite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
2. (Bot.) Any plant of the genus {Sideritis}; ironwort.
From WordNet (r) 1.7 (wn)
siderite
n 1: iron ore in the form of ferrous carbonate [syn: {chalybite}]
2: a meteorite consisting principally of nickel and iron
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