Gossan
[gɔsn]
Definition
(n.) Decomposed rock, usually reddish or ferruginous (owing to oxidized pyrites), forming the upper part of a metallic vein.
Editor: Samantha
Definition
n. (prov.) decomposed rock usually ferruginous forming the upper part of a metallic vein.—Also Gozz′an.
Edited by Everett