penroseite
noun
pen·rose·ite
ˈpenˌrōˌzīt
plural -s
: a mineral (Ni,Cu,Pb)Se2 structurally like pyrite consisting of a selenide of lead, copper, and nickel and occurring in lead gray radiating columnar masses (hardness 3, specific gravity 6.9)
Word History
Etymology
Richard A. F. Penrose †1931 American geologist + English -ite