Teschenite

Teschenite is a type of coarse or medium grained igneous rock, akin to gabbro or dolerite, that contains essential analcime.

The term crinanite has previously been used as a synonym for teschenite (particularly for deposits with increased analcime content),[1] but there have been attempts to standardise terminology by stopping its use.

[5][8][9] Hohenegger used the term to describe Cretaceous masses of Austrian Silesia near Teschen, which up until that point were listed as a range of minerals, such as diorite, diabase, greenstone or flood basalt, among others.

Later in 1866 Hohenegger's definition of the mineral was further refined by Gustav Tschermak, who differentiated between the darker, basalt-like deposits rich in olivine and what is now called teschenite as he identified the former as picrite.

[12] Specific documented deposits are in Tichá, in the basin of the Ostravice river, in the Řepiště municipality and in a quarry near Žermanice Reservoir.