ˈpentlənˌdīt noun
( -s )
Etymology: French pentlandite, from Joseph B. Pentland died 1873 Irish traveler & scientist + French -ite
: a mineral (Fe,Ni) 9 S 8 consisting of an isometric nickel iron sulfide that is found in pale bronze-yellow masses and that is the principal ore of nickel (hardness 3.5-4, specific gravity 4.60)