Siderite

1. n. Any plant of the genus Sideritis; ironwort.
2. n. 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.
3. n. A meteorite consisting solely of metallic iron.
4. n. An indigo-blue variety of quartz.
5. n. Formerly, magnetic iron ore, or loadstone.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.