The Collaborative International Dictionary
Stannine
Stannine \Stan"nine\ (-n[i^]n), Stannite \Stan"nite\ (-n[imac]t), n. (Min.) A mineral of a steel-gray or iron-black color; tin pyrites. It is a sulphide of tin, copper, and iron.
Wiktionary
stannine
n. (context mineralogy English) The mineral stannite.