plagioclase series Isomorphous series of feldspars ranging in composition between albite (NaAlSi3O8) and anorthite (CaAl2Si2O8). Between the two end-members there is a continuous solid solution series: albite, oligoclase, andesine, labradorite, bytownite, anorthite. Usually, the higher the temperature of formation the more likely the feldspar is to be calcium-rich, whereas at lower temperatures sodium-rich plagioclase tends to form. The preservation of electrical neutrality in the plagioclases is achieved by concomitant substitution of Ca2+ and Al3+ by Na+ and Si4+. See PLAGIOCLASE FELDSPAR.
More From encyclopedia.com
Series , se·ries / ˈsi(ə)rēz/ • n. (pl. same) a number of things, events, or people of a similar kind or related nature coming one after another: the explosio… Temperature , In everyday terms, temperature is a measure of the "hotness" or "coldness" of a substance. More technically, temperature indicates the direction in w… Effective Temperature , effective temperature Alkali Feldspar , alkali feldspar A group of silicate minerals that contain the alkali metal elements potassium and sodium. The normal feldspar minerals (including the… Isotherm , Isotherm Isotherms are lines that connect points of equal temperature on weather maps, so at every point along a given isotherm the temperature value… Thermometer , A thermometer is a device that registers the temperature of a substance relative to some agreed upon standard. Thermometers use changes in the physic…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like