MetaGlossary.com: Oligoclase

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Keywords: Triclinic, Feldspar, Plagioclase, Soda, Lime

Related Terms: Alkaline, Andesite, Anorthosite, Aplite, Augite, Basalt, Basic, Batholith, Diabase, Diorite, Dolerite, Enstatite, Feldspar, Felsite, Gabbro, Granite, Granitic, Greenstone , Hypersthene, Mesosiderite, Microcline, Norite, Olivine, Orthoclase, Pegmatite, Peridotite, Plagioclase, Pyroxene, Pyroxenite, Rhyolite, Syenite, Trachyte, Nephelinite, Kimberlite, Mafic, Pluton, Ultrabasic, Granodiorite, Ultramafic Rock, Ultramafic, Dacite, Felsic, Pallasite, Carbonatite, Lamprophyre, Pillow Basalt, Plutonic Rock, Monzonite, Hypabyssal, Tonalite

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A triclinic soda-lime feldspar. See Feldspar.

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a variety of feldspar, a non-metallic mineral.

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any of a rock-forming series of triclinic feldspars

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a plagioclase containing more sodium than calcium, occurring in light gray, yellow, or greenish crystals. [AHDOS

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(Also called Plagioclase) A triclinic feldspar made of soda- lime.

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Oligoclase is a rock-forming mineral belonging to the plagioclase feldspars. In chemical composition and in its crystallographic and physical characters it is intermediate between albite (NaAlSi3O8) and anorthite (CaAl2Si2O8). The albite : anorthite molar ratio ranges from 90 : 10 to 70 : 30.

http://en.wikipedia.org/wiki/Oligoclase

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