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Gossan is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein.
From Cornish gossen from gos, blood from Old Cornish guit
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Medium Grained Rock, Opaque Rock
Claystone is a fine-grained, dark gray to pink sedimentary rock which mainly consists of compacted and hardened clay
From English clay and stone as the rock contains more amount of clay
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock