langbeinite
noun
lang·bein·ite ˈlaŋ-ˌbī-ˌnīt 
: a mineral that is a sulfate of potassium and magnesium used in the fertilizer industry
Word History
Etymology
German Langbeinit, from A. Langbein, 19th century German industrialist
First Known Use
circa 1897, in the meaning defined above