Siderite

Sid·er·ite

Siderite

n.
  1. 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. (Min.)
  2. Any plant of the genus Sideritis; ironwort. (Bot.)