melanotekite
noun
mel·a·no·te·kite
-nōˈtēˌkīt
plural -s
: a black or dark gray mineral Pb2Fe2Si2O9 that is a lead iron silicate
Word History
Etymology
Swedish melanotekit, from melan- + Greek tēkein to melt + Swedish -it -ite; from its fusing to a black glass