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iron hat

noun, Geology
1.

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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4
5
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