What is "sparry iron"

Siderite \Sid"er*ite\, n. [L. sideritis loadstone, Gr. ????, ????, of iron, from ???? iron.]

1. (Min.)

   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.

   2. A meteorite consisting solely of metallic iron.

   3. An indigo-blue variety of quartz.

   4. Formerly, magnetic iron ore, or loadstone.

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