siderites

In Europe there are only three large sources of high-grade iron ore which have heretofore been drawn on largely, -- the magnetite deposits of northern Sweden, the hematites and siderites of the Bilbao and adjacent districts of northern Spain, and the magnetite-hematite deposits of southern Russia.

The Economic Aspect of Geology 1915

Chemically and organically deposited minerals of this class are usually susceptible to further alteration by surface weathering, and some of them, for instance the phosphates and siderites, are thus secondarily concentrated.

The Economic Aspect of Geology 1915

These last are the meteorites, or siderites, or aërolites, or bolides, of our museums.

Pioneers of Science Oliver Lodge 1895