alkali igneous rock

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• 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

• Igneous rock — Geologic provinces of the world (USGS)   Shield …   Wikipedia

• Rock microstructure — includes the texture of a rock and the small scale rock structures. The words texture and microstructure are interchangeable, with the latter preferred in modern geological literature. However, texture is still acceptable because it is a useful… …   Wikipedia

• alkali rock — Mineral. any igneous rock with a marked preponderance of alkali and a low percentage of silica. * * * …   Universalium

• alkali rock — Mineral. any igneous rock with a marked preponderance of alkali and a low percentage of silica …   Useful english dictionary

• metamorphic rock — Any of a class of rocks that result from the alteration of preexisting rocks in response to changing geological conditions, including variations in temperature, pressure, and mechanical stress. The preexisting rocks may be igneous, sedimentary,… …   Universalium

• North Atlantic Igneous Province — The North Atlantic Igneous Province (NAIP) is a large igneous province estimated to be at least 1.3×106 km2 in area and 6.6×106 km3 in volume.[1] Geographically, the NAIP makes up all of the North Atlantic Ocean as well as the Paleocene and… …   Wikipedia

• sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …   Universalium

• Moon rock — Olivine basalt collected by Apollo 15. Moon rock describes rock that formed on the Earth s moon. The term is also loosely applied to other lunar materials collected during the course of human exploration of the Moon. The rocks collect …   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

• tinguaite — ▪ rock       pale to dark green, very fine grained igneous rock that may be considered the dike (tabular body injected in fissures) equivalent of phonolite. It contains alkali feldspar and nepheline, with aegirine or aegirine augite. Tinguaite in …   Universalium