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gossan

[gos-uh n, goz-] /ˈgɒs ən, ˈgɒz-/
noun
1.
a rust-colored deposit of mineral matter at the outcrop of a vein or orebody containing iron-bearing materials.
Also called iron hat.
Origin of gossan
1770-1780
1770-80; orig. dial. (Cornwall) < Cornish, derivative of gōs blood; akin to Welsh gwaed
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for gossan
  • When a saprolite layer is produced at a sulfide ore body the leached zone is often referred to as a gossan.
  • gossan in shallow, caved pits locally is coated with malachite.
  • Sulfide-bearing gossan in one pit contains tetrahedrite.
  • The iron-stained hornfels, which is locally gossan, contains disseminated pyrite and small quartz-pyrite veinlets.
  • gossan typically has an earthy or cellular texture and many ore deposits have been discovered by exploration for gossans.

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