mackinawite
/ˈmakɪnɔːʌɪt/Mineralogy
noun
A bronze-coloured tetragonal sulphide of iron and usually nickel in non-stoichiometric proportions, occurring as grains and minute lamellae.
Origin
1960s. From Mackinaw, the name of a mine in Snohomish County, Washington State, U.S.A. + -ite.