troilite
noun
troi·lite ˈtrō-ə-ˌlīt 
ˈtrȯi-ˌlīt
: a mineral that is a variety of pyrrhotite and that is widely but sparsely distributed (as on earth, in meteorites, and in lunar soil samples)
Example Sentences
Recent Examples on the Web Chemical analysis of the glass identified minerals only found in extraterrestrial rocks and minerals, such as cubanite, troilite, pyrrhotite lath, or calcium-aluminum-rich inclusions. 
Elizabeth Gamillo, Smithsonian Magazine, 8 Nov. 2021 The analysis also showed minerals like cubanite and troilite, both found in the Wild 2 comet and meteorites. Ashley Strickland, CNN, 3 Nov. 2021
Elizabeth Gamillo, Smithsonian Magazine, 8 Nov. 2021 The analysis also showed minerals like cubanite and troilite, both found in the Wild 2 comet and meteorites. Ashley Strickland, CNN, 3 Nov. 2021 Word History
Etymology
German Troilit, from Domenico Troili, 18th century Italian scientist + German -it -ite
First Known Use
circa 1868, in the meaning defined above