sphalerite
noun
sphal·er·ite ˈsfa-lə-ˌrīt 
: a mineral composed essentially of zinc sulfide that is the most important ore of zinc
called also zinc blende
Word History
Etymology
German Sphalerit, from Greek sphaleros deceitful, from sphallein to cause to fall; from its often being mistaken for galena — more at spill entry 1
First Known Use
circa 1868, in the meaning defined above