For example cobalt langbeinite shows a broad absorption around 555 nm due to the cobalt 4 T 1g ( F ) ?! 4 T 1g ( P ) electronic transition.
12.
The Permian Basin is also a major source of potassium salts ( potash ), which are mined from bedded deposits of sylvite and langbeinite in the Salado Formation of Permian age.
13.
Double sulfates of the composition, where " A " is a univalent cation and " B " is a divalent metal ion are referred to as langbeinites, after the prototypical potassium magnesium sulfate.
