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Albite-Anorthite Series

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6 - 6½
Series Formula:
Na(AlSi3O8) to Ca(Al2Si2O8)
A series between Albite and Anorthite

Feldspar Group.
Alternate name for the plagioclase series of feldspars.

In petrology, the plagioclase series are defined based on their percentage of albite (Ab) to anorthite (An). Compositions of individual samples are usually written as An24Ab76 meaning in this case that it is 24% anorthite and 76% albite.

List of plagioclase group members as used in petrology.

AnorthiteAn100Ab to An90Ab10CaAl2Si2O8
BytowniteAn90Ab10 to An70Ab30(Ca,Na)Al(Al,Si)Si2O8
LabradoriteAn70Ab30 to An50Ab50(Ca,Na)Al(Al,Si)Si2O8
AndesineAn50Ab50 to An30Ab70(Na,Ca)Al(Si,Al)Si2O8
OligoclaseAn30Ab70 to An10Ab90(Na,Ca)Al(Si,Al)Si2O8
AlbiteAn10Ab90 to AnAb100NaAlSi3O8

Classification of Albite-Anorthite Series

Physical Properties of Albite-Anorthite Series

Hardness (Mohs):
6 - 6½

Other Names for Albite-Anorthite Series

Name in Other Languages:
Norwegian (Bokmål):Plagioklas
Serbian (Cyrillic Script):Плагиоклас
Simplified Chinese:斜长石

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Albite-Anorthite Series in petrology

An essential component of (items highlighted in red)
Common component of (items highlighted in red)

References for Albite-Anorthite Series

Reference List:
Dickson, F.W. (1968) Growth of K-feldspars and plagioclase by replacement processes in rock of the Papoose Flat pluton and in country rocks, Inyo Mountains, California. Geological Society of America Special Papers 101, Abstract for 1966: 53-54.

Carpenter, M.A., McConnell, J.D.C., Navrotsky, A. (1985) Enthalpies of ordering in the plagioclase feldspar solid solution. Geochimica et Cosmochimica Acta: 49: 947-966.

Salje E., Kuscholke, B., Wruck, B., Kroll, H. (1985) Thermodynamics of sodium feldspar II: experimental results and numerical calculations. Physics and Chemistry of Minerals: 12: 99-107.

Redfern, S.A.T., Salje, E. (1987) Thermodynamics of plagioclase II: temperature evolution of the spontaneous strain at the I1‾ ↔ P1‾ phase transition in anorthite. Physics and Chemistry of Minerals: 14: 189-195.

Salje, E. (1987) Thermodynamics of plagioclase I: theory of the I1‾ - P1‾ phase transition in anorthite and Ca-rich plagioclases. Physics and Chemistry of Minerals: 14: 181-188.

Redfern, S.A.T., Graaeme-Barber, A., Salje, E. (1988) Thermodynamics of plagioclase III: spontaneous strain at the I1‾ - P1‾ phase transition in Ca-rich plagioclase. Physics and Chemistry of Minerals: 16: 157-163.

Redfern, S.A.T. (1992) The effect of Al/Si disorder on the I1‾ - P1‾ co-elastic phase transition in Ca-rich plagioclase. Physics and Chemistry of Minerals: 19: 246-254.

Weinbruch, S., Müller, W.F. (1995) Constraints on the cooling rates of chondrules from the microstructure of clinopyroxene and plagioclase. Geochimica et Cosmochimica Acta: 59: 3221-3230.

Lee, M.R., Thompson, P., Poeml, P., Parsons, I. (2003) Peristeritic plagioclase in North Sea hydrocarbon reservoir rocks: implications for diagenesis, provenance and stratigraphic correlation. American Mineralogist: 88: 866-875.

Angel, R.J. (2004) Equations of state of plagioclase feldspars. Contributions to Mineralogy and Petrology: 146: 506-512.

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Localities for Albite-Anorthite Series

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