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Albite-Anorthite Series

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Colour:
White
Lustre:
Vitreous
Hardness:
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.

NameCompositionFormula
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



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Physical Properties of Albite-Anorthite SeriesHide

Vitreous
Colour:
White
Streak:
White
Hardness:
6 - 6½ on Mohs scale

Age distributionHide

Recorded ages:
to Neogene : 2445 ± 4 Ma to 14.9 ± 0.4 Ma - based on 20 recorded ages.

Synonyms of Albite-Anorthite SeriesHide

Other Language Names for Albite-Anorthite SeriesHide

Estonian:Plagioklass
Finnish:Plagioklaasi
Galician:Plaxioclasio
German:Plagioklas
Hungarian:Plagioklászok
Icelandic:Plagíóklas
Italian:Plagioclasio
Korean:사장석
Lithuanian:Plagioklazas
Norwegian (Bokmål):Plagioklas
Kalknatronfeltspat
Serbian (Cyrillic Script):Плагиоклас
Simplified Chinese:斜长石
Slovak:Plagioklas
Spanish:Plagioclasa
Swedish:Plagioklas

Varieties of Albite-Anorthite SeriesHide

Barium-AlbiteFeldspar group. A variety of Plagioclase with Albite 44%, Anorthite 42% and Celsian 14%.

Originally reported from Kaso Mine, Kanuma, Tochigi Prefecture, Kanto Region, Honshu Island, Japan.
High PlagioclaseA high-temperature form.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz80 photos of Albite-Anorthite Series associated with Quartz on mindat.org.
Biotite31 photos of Albite-Anorthite Series associated with Biotite on mindat.org.
Muscovite29 photos of Albite-Anorthite Series associated with Muscovite on mindat.org.
Almandine24 photos of Albite-Anorthite Series associated with Almandine on mindat.org.
Schorl19 photos of Albite-Anorthite Series associated with Schorl on mindat.org.
Fluorapatite16 photos of Albite-Anorthite Series associated with Fluorapatite on mindat.org.
Rutile12 photos of Albite-Anorthite Series associated with Rutile on mindat.org.
Hornblende12 photos of Albite-Anorthite Series associated with Hornblende on mindat.org.
Diopside11 photos of Albite-Anorthite Series associated with Diopside on mindat.org.
Corundum10 photos of Albite-Anorthite Series associated with Corundum on mindat.org.

Other InformationHide

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 petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

References for Albite-Anorthite SeriesHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.

Internet Links for Albite-Anorthite SeriesHide

Localities for Albite-Anorthite SeriesHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow