chromite
noun
chro·mite ˈkrō-ˌmīt 
1
: a black mineral that consists of an oxide of iron and chromium and is the only chromium ore
2
: an oxide of divalent chromium
Example Sentences
Recent Examples on the Web Owens-Brockway uses iron chromite to make green glass at its facility, according to the federal agency. 
Jamie Goldberg, oregonlive, 17 Sep. 2021 The researchers looked at the meteorite through an electron microscope, finding traces of chromite, phosphate, and iron-nickle-sulfide inside the diamonds, minerals that only form under extreme pressure. Jason Daley, Smithsonian, 19 Apr. 2018 In addition to its leading nickel-export role, the Philippines has large reserves of gold, copper and chromite, among other metals and minerals. Biman Mukherji, WSJ, 24 July 2017
Jamie Goldberg, oregonlive, 17 Sep. 2021 The researchers looked at the meteorite through an electron microscope, finding traces of chromite, phosphate, and iron-nickle-sulfide inside the diamonds, minerals that only form under extreme pressure. Jason Daley, Smithsonian, 19 Apr. 2018 In addition to its leading nickel-export role, the Philippines has large reserves of gold, copper and chromite, among other metals and minerals. Biman Mukherji, WSJ, 24 July 2017 Word History
Etymology
probably borrowed from German Chromit, from Chrom chrome entry 1 + -it -ite entry 1
First Known Use
1840, in the meaning defined at sense 1