stripes
Veins of nepheline (liebeneritic) syenites and nepheline syenite pegmatites up to 2 m thick are present in the intrusion, which is essentially of syenites. The nepheline syenites of the veins are variable in composition and structure with both trachytic and massively textured types. They contain up to 20-25% of nepheline, which may also be pseudomorphed by cancrinite, analcime, zeolites and spreustein, 65-70% of feldspar, including microperthite and albite-oligoclase, and 5-10% of aegirine-augite, salite, hastingsite and lepidomelane. Accessory minerals, forming about 2.5% of the rocks, include melanite, titanite, orthite, magnetite and apatite.
BORODIN, L.S., LAPIN, A.V. and PYATENKO, I.K. 1974. Alkaline provinces of Europe. In L.S. Borodin (ed), Principal provinces and formations of alkaline rocks. 11-90. Nauka, Moscow.
LEVIN, V.Y. 1974. The alkaline province of the Ilmenogorsk-Vishnevy Gory (formation of the nepheline syenite of the Urals). Nauka, Moscow. 224 pp.
LEVIN, A.Y., PETROV, V.I. and LEVINA I.A. 1973. Experience of the facial and formation analyses of the nepheline syenite of the Urals. In. Problems of the petrology of the Urals. Proceedings of the Institute of Geology and Geochemistry, Sverdlovsk 100: 134-54.