Updated About encyclopedia.com content Print Article
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
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… Thermosphere , Based on the vertical temperature profile in the atmosphere, the thermosphere is the highest layer, located above the mesosphere . While in the tropo… William Francis Giauque , Giauque, William Francis GIAUQUE, WILLIAM FRANCIS (b. Niagara Falls, Ontario, Canada, 12 May 1895; d. Berkeley, California, 28 March 1982) Giauque re… Metastable , metastable Applied to a phase which is apparently stable but is capable of reaction if disturbed, a state usually due to the slowness of a system to… Alkali Feldspar , alkali feldspar A group of silicate minerals that contain the alkali metal elements potassium and sodium. The normal feldspar minerals (including the… Thermophile , thermophile thermophilic Describing an organism that lives and grows optimally at extremely high temperatures, typically over 40°C. The majority are…