The Collaborative International Dictionary
Necronite
Necronite \Nec"ro*nite\, n. [Gr. nekro`s a dead body.] (Min.) Fetid feldspar, a mineral which, when struck, exhales a fetid odor.
Wiktionary
necronite
n. (context mineralogy English) fetid feldspar, a mineral that gives off an unpleasant odour when struck.