SIDERITE

siderite. Siderite, n. phosphate of iron or iron combined with phosphoric acid

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Sid″er‐ite, n. [[L. sideritis loadstone, Gr. ����, ����, of iron, from ���� iron.]] 1. 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. 2. (Bot.) Any plant of the genus Sideritis; ironwort.