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Sid"erite 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.
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