Aegirine is an inosilicate member of the clinopyroxene group. Aegirine is the sodium endmenber of the aegirine-augite series. Aegirine has the chemical formula NaFeSi2O6 in which the iron is present as Fe3+. In the aegirine-augite series the sodium is variably replaced by calcium with iron(II) and magnesium replacing the iron(III) to balance the charge. Aluminium also substitutes for the iron(III). The silicate minerals make up the the largest and most important class of rock-forming minerals. ... The Pyroxenes are a group of important rock-forming silicate minerals found in many igneous and metamorphic rocks. ... Augite Categories: Mineral stubs | Minerals | Silicate minerals ...
Aegirine occurs as dark green monoclinic prismatic crystals. It occurs in alkali nepheline syenites and similar igneous rocks. Localities include Mont Saint-Hilaire, Quebec, Canada; Kongsberg, Norway; Narsarssuk, Greenland; Kola Peninsula, Russia; Magnet Cove, Arkansas, USA; Kenya; Scotland and Nigeria. In crystallography, the monoclinic crystal system is one of the 7 lattice point groups. ... Nepheline syenite is a coarse crystalline igneous rock composed primarily of orthoclase alkali-feldspars, nepheline and mafic minerals such as the sodium rich pyroxenes and amphiboles. ... Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. ... Mont Saint-Hilaire (en. ... ... Kongsberg (lit. ... The Kola Peninsula in relation to Scandinavia, the White Sea, Barents Sea, Lake Onega, Lake Ladoga, and foreign countries. ... State nickname: The Natural State Other U.S. States Capital Little Rock Largest city Little Rock Governor Mike Huckabee Official languages English Area 137,732 km² (29th) - Land 134,856 km² - Water 2,876 km² (2. ... Scotland (Alba in Scottish Gaelic) is a country in northwest Europe, occupying the northern third of the island of Great Britain. ...
Aegirine was named after the Teutonic god of the sea. A synonym for the mineral is acmite (from Greek) in reference to the typical pointed crystals. The term Germanic peoples may refer to: the Germanic tribes that in the first millennium were seen as a barbarian threat by the Roman Empire and its successors; the Germanic Christianity that in the second millennium came to dominate much of Northern Europe, politically organized in the Holy Roman Empire...
The commonest ferro-magnesian mineral is pale green augite, which may be surrounded by rims of dark-green, pleochroic soda-augite (aegirine).
The rock of Salem, Mass., U.S.A., is a mica-foyaite rich in albite and aegirine; it accompanies granite and essexite.
Jacupirangite (from Jacupiranga in Brazil) is a flish rock composed of titaniferous augite, magnetite, ilmenite, perofskite and nepheline, with secondary biotite.
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