| siderite | 1. <chemical> 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 colour. Called also sparry iron, spathic iron. A meteorite consisting solely of metallic iron. An indigo-blue variety of quartz. Formerly, magnetic iron ore, or loadstone. 2. <botany> Any plant of the genus Sideritis; ironwort. Origin: L. Sideritis loadstone, Gr, of iron, from iron. Source: Websters Dictionary (01 Mar 1998) |
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