Teschenite is one of the important type of rocks. If we have to define Teschenite in general, Teschenite is coarse- to fine-grained, dark-coloured intrusive igneous rock that usually occurs in sills, dikes and irregular masses and is always altered to some extent. Teschenite comes under . All Igneous Rocks have similar properties and formation process. Along with Teschenite Definition, know more about the History of Teschenite, Etymology of Teschenite in next sections.