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gossan

[ gos-uhn, goz- ]
/ ˈgɒs ən, ˈgɒz- /
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noun
a rust-colored deposit of mineral matter at the outcrop of a vein or orebody containing iron-bearing materials.
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Also called iron hat.

Origin of gossan

First recorded in 1770–80; originally dialect (Cornwall), from Cornish, derivative of gōs “blood”; akin to Welsh gwaed
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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