Sid·er·ite, n.
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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Spar·ry a. Resembling spar, or consisting of spar; abounding with spar; having a confused crystalline structure; spathose.
Sparry iron Min., siderite. See Siderite (a).
Sparry limestone Min., a coarsely crystalline marble.
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