taco-nite

taconite

[tak-uh-nahyt]
noun
a low-grade iron ore, containing about 27 percent iron and 51 percent silica, found as a hard rock formation in the Lake Superior region.

Origin:
1890–95, Americanism; named after the Taconic mountain range (east of the Hudson River); see -ite1

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World English Dictionary
taconite (ˈtækəˌnaɪt)
 
n
a fine-grained sedimentary rock containing magnetite, haematite, and silica, which occurs in the Lake Superior region: a low-grade iron ore
 
[C20: named after the Taconic Mountains in New England]

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