Teschenite is a type of coarse or medium grained igneous rock akin to gabbro or dolerite and containing essential analcime. Its name is derived from the town of Český Těšín, where it was discovered. The term crinanite has previously been used as a synonym for teschenite,[1] (particularly with increased analcime content) but there have been attempts to standardise terminology by stopping its use.[2][3] Rocks related to teschenite are referred to as rocks of the teschenite association.[4]