Gossan

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

Gossan (eiserner hut or eisenhut) is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein.

Excerpt from the Wikipedia article “Gossan”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: charlo.be, CC BY 2.0, via Wikimedia Commons.