Urukit

Urukit is oval in outline and occupies an area of 0.5x1 km (Butakova and Egorov, 1962). It is composed of melteigite and ijolite which are cut by small bodies of nepheline syenite. The melteigites have a trachytic texture and are composed essentially of clinopyroxene with small amounts of nepheline, biotite, titanomagnetite, titanite and perovskite. There followed intrusion of ijolite/nephelinite, which is a massively textured rock containing minor titanomagnetite, phlogopite, perovskite, titanite, apatite and calcite. The country rocks are dolomites, which are metamorphosed at the contacts.