gossan

noun
gos·san | \ˈgä-sᵊn \

Definition of gossan 

: decomposed rock or vein material of reddish or rusty color that results from oxidized pyrites

First Known Use of gossan

1776, in the meaning defined above

History and Etymology for gossan

Corn gossen, from gōs blood

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The first known use of gossan was in 1776

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