apatite-nepheline rock

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• Nepheline syenite — of the Intrusive Complex of Tanguá, State of Rio de Janeiro, Brasil (Motoki et al., 2011a) Nephelene syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar. The rocks are mostly pale colored, grey or… …   Wikipedia

• igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium

• Petrography — is that branch of petrology which focuses on detailed descriptions of rocks. Someone who studies petrography is called a petrographer. The mineral content and the textural relationships within the rock are described in detail. Petrographic… …   Wikipedia

• Alnön — is an island in the Gulf of Bothnia just outside Sundsvall in Medelpad, Sweden. It has an area of 65 km2 and a population of 7,951 (2005 12 31), which in summertime doubles. Most inhabitants work in Sundsvall and other towns on the mainland.The… …   Wikipedia

• ijolite — ▪ rock       intrusive igneous rock that is composed essentially of nepheline and an alkali pyroxene, usually aegirine augite. It is the plutonic equivalent of the volcanic nephelinites. Typically, the pyroxene is well crystallized and is… …   Universalium

• leucitite — ▪ rock       extrusive igneous rock, coloured ash gray to nearly black, that contains leucite and augite as large, single crystals (phenocrysts) in a fine grained matrix (groundmass) of leucite, augite, sanidine, apatite, titanite, magnetite, and …   Universalium

• limburgite — ▪ rock       dark coloured volcanic rock that resembles basalt but normally contains no feldspar. It is associated principally with nepheline basalts and leucite basalts; it also occurs with monchiquite, from which it is not easily distinguished …   Universalium

• Litchfieldite — is a rare metamorphosed igneous rock. It is a variety of nepheline syenite and is composed of two near pure phases of feldspar, albite and microcline, with predominance of the first one, plus nepheline, sodalite, cancrinite and calcite. The mafic …   Wikipedia

• Geochemistry — The field of geochemistry involves study of the chemical composition of the Earth and other planets, chemical processes and reactions that govern the composition of rocks and soils, and the cycles of matter and energy that transport the Earth s… …   Wikipedia

• Mining industry of Russia — The mineral industry of Russia is one of the world s leading mineral industries and accounts for a large percentage of the Commonwealth of Independent States production of a range of mineral products, including metals, industrial minerals, and… …   Wikipedia

• Leucite — is a rock forming mineral composed of potassium and aluminium tectosilicate K [AlSi2O6] . Crystals have the form of cubic icositetrahedra but, as first observed by Sir David Brewster in 1821, they are not optically isotropic, and are therefore… …   Wikipedia