An exposed, oxidized percentage of a mineral vein, specially a rust-colored outcrop of iron ore.
decomposed rock, usually reddish or ferruginous (due to oxidized pyrites), creating top of the part of a metallic vein
Decomposed rock, typically reddish or ferruginous (because of oxidized pyrites), developing the upper section of a metallic vein. Known as additionally metal cap.
In mining, the ferruginous quartzose material which frequently types a sizable area of the outcrop of a lode where metallic contents at depths occur chiefly in the shape of sulphids, among which pyrites, a mixture of sulphur and metal, is rarely wanting, and it is often present in variety.