Siderite
Siderite , noun
[Latin sideritis loadstone, Greek {not transcribed}, {not transcribed}, of iron, from {not transcribed} iron.]
1.
(a) (Mineralogy) Carbonate of iron, an important ore of iron occurring generally in cleavable masses, but also in rhombohedral crystals. It is of a light yellowish brown color. Called also sparry iron, spathic iron.
(b)
(Mineralogy) A meteorite consisting solely of metallic iron.
(c)
(Mineralogy) An indigo-blue variety of quartz.
(d)
(Mineralogy) Formerly, magnetic iron ore, or loadstone.
2.
(Botany) Any plant of the genus Sideritis; ironwort.