Eudialyte Urtite

Urtite is a coarse-grained alkali intrusive rock containing 80 to 90% of nepheline; rarely can contain almost exclusively Eudialyte in place of Nepheline. It may also contain as much as 10 percent aegirine or aegirine-augite, as well as admixtures of albite and sphene. Urtite was first discovered in the Lovozero Massif (Luiavr-Urt) on the Kola Peninsula (hence the name). Urtite is not widely distributed and is frequently found with ijolite and may be associated with intrusive carbonatites. It occurs in the form of small, often sheetlike, bodies among other alkali rocks.

Bibliography

• Cox et al. (1979): The Interpretation of Igneous Rocks, George Allen and Unwin, London.
• Howie, R. A., Zussman, J., & Deer, W. (1992). An introduction to the rock-forming minerals (p. 696). Longman.
• Le Maitre, R. W., Streckeisen, A., Zanettin, B., Le Bas, M. J., Bonin, B., Bateman, P., & Lameyre, J. (2002). Igneous rocks. A classification and glossary of terms, 2. Cambridge University Press.
• Middlemost, E. A. (1986). Magmas and magmatic rocks: an introduction to igneous petrology.
• Shelley, D. (1993). Igneous and metamorphic rocks under the microscope: classification, textures, microstructures and mineral preferred-orientations.
• Vernon, R. H. & Clarke, G. L. (2008): Principles of Metamorphic Petrology. Cambridge University Press.

Foto
Colorless Eudialyte crystal and green Aegirine crystals. Urtite from Kola (Russia). PPL image , 2x (Field of view = 7mm)	Eudialyte crystal and green Aegirine crystals. Urtite from Kola (Russia). XPL image , 2x (Field of view = 7mm)	Colorless Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). PPL image , 2x (Field of view = 7mm)
Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). XPL image , 2x (Field of view = 7mm)	Colorless Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). PPL image , 2x (Field of view = 7mm)	Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). XPL image , 2x (Field of view = 7mm)
Colorless Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). PPL image , 2x (Field of view = 7mm)	Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). XPL image , 2x (Field of view = 7mm)	Colorless Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). PPL image , 2x (Field of view = 7mm)
Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). XPL image , 2x (Field of view = 7mm)	Colorless Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). PPL image , 2x (Field of view = 7mm)	Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). XPL image , 2x (Field of view = 7mm)
Colorless Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). PPL image , 2x (Field of view = 7mm)	Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). XPL image , 2x (Field of view = 7mm)	Colorless Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). PPL image , 2x (Field of view = 7mm)
Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). XPL image , 2x (Field of view = 7mm)	Colorless Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). PPL image , 2x (Field of view = 7mm)	Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). XPL image , 2x (Field of view = 7mm)
Colorless Eudialyte crystals, green Aegirine crystals and titanite. Urtite from Kola (Russia). PPL image , 2x (Field of view = 7mm)	Eudialyte crystals, green Aegirine crystals and titanite. Urtite from Kola (Russia). XPL image , 2x (Field of view = 7mm)	Aegirine crystals. Urtite from Kola (Russia). PPL image , 10x (Field of view = 2mm)
Colorless Eudialyte crystals and green Aegirine crystals. Urtite from Kola (Russia). PPL image , 10x (Field of view = 2mm)	Aegirine crystals. Urtite from Kola (Russia). PPL image , 10x (Field of view = 2mm)	Aegirine crystals. Urtite from Kola (Russia). XPL image , 10x (Field of view = 2mm)
Titanite and Aegirine crystals. Urtite from Kola (Russia). PPL image , 10x (Field of view = 2mm)	Aegirine crystals. Urtite from Kola (Russia). PPL image , 10x (Field of view = 2mm)	Aegirine crystals. Urtite from Kola (Russia). XPL image , 10x (Field of view = 2mm)
Colorless Eudialyte crystal and green Aegirine crystals. Urtite from Kola (Russia). PPL image , 10x (Field of view = 2mm)	Eudialyte crystal and green Aegirine crystals. Urtite from Kola (Russia). XPL image , 10x (Field of view = 2mm)	Aegirine crystals. Urtite from Kola (Russia). XPL image , 10x (Field of view = 2mm)