The Collaborative International Dictionary
Stromeyerite
Stromeyerite \Stro"mey`er*ite\, n. [So named from the German chemist Friedrich Stromeyer.] (Min.) A steel-gray mineral of metallic luster. It is a sulphide of silver and copper.
Wiktionary
stromeyerite
n. (context mineralogy English) An orthorhombic-dipyramidal mineral containing copper, silver, and sulfur.
Wikipedia
Stromeyerite
Stromeyerite is a sulfide mineral of copper and silver, with the chemical formula Ag Cu S. It forms opaque blue grey to dark blue orthorhombic crystals.
It was discovered in 1832 in Central Bohemia Region, Czech Republic, and named after the German chemist, Friedrich Stromeyer who performed the first analysis of the mineral.