ˈläŋˌbīˌnīt noun
( -s )
Etymology: German langbeinit, from A. Langbein, 19th century German chemist + German -it -ite
: a mineral K 2 Mg 2 (SO 4 ) 3 much used in the fertilizer industry consisting of potassium magnesium double sulfate in colorless isometric crystals