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Feldspar Group

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A group of silicate minerals. May contain (very minor amount of) OH groups, considered as defects (e.g., Yang et al., 2015).

In petrology the group is split into two major groups:

Alkali feldspar - feldspar minerals rich in sodium or potassium.
Plagioclase - the albite to anorthite series.

Classification of Feldspar Group

Relationship of Feldspar Group to other Species

Group Members:
Albite Na(AlSi3O8)
Amazonite K(AlSi3O8)
Andesine (Na,Ca)[Al(Si,Al)Si2O8]
Anorthite Ca(Al2Si2O8)
Anorthoclase (Na,K)AlSi3O8
Banalsite Na2BaAl4Si4O16
Buddingtonite (NH4)(AlSi3)O8
Bytownite (Ca,Na)[Al(Al,Si)Si2O8]
Celsian Ba(Al2Si2O8)
Dmisteinbergite Ca(Al2Si2O8)
Filatovite K(Al,Zn)2(As,Si)2O8
Hexacelsian BaAl2Si2O8
Hyalophane (K,Ba)[Al(Si,Al)Si2O8]
Kokchetavite K(AlSi3O8)
Kumdykolite Na(AlSi3O8)
Labradorite (Ca,Na)[Al(Al,Si)Si2O8]
Microcline K(AlSi3O8)
Oligoclase (Na,Ca)[Al(Si,Al)Si2O8]
Orthoclase K(AlSi3O8)
Paracelsian Ba(Al2Si2O8)
Reedmergnerite NaBSi3O8
Rubicline Rb(AlSi3O8)
Sanidine K(AlSi3O8)
Slawsonite Sr(Al2Si2O8)
Stronalsite Na2SrAl4Si4O16
Svyatoslavite Ca(Al2Si2O8)

Other Names for Feldspar Group

Name in Other Languages:
Bosnian (Latin Script):Feldspat
Lithuanian:Lauko špatas
Norwegian (Bokmål):Feltspat
Norwegian (Nynorsk):Feltspat
Serbian (Cyrillic Script):Фелдспат
Simplified Chinese:长石族

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.

Feldspar Group in petrology

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

References for Feldspar Group

Reference List:
Smith, J.V. and MacKenzie, W.S. (1958) Alkali feldspars. IV. The cooling history of high-temperature sodium-rich feldspars. American Mineralogist: 43: 872-889.

Laves, F. (1960) The feldspars, their polysynthetic twinning and their phase relations. Rend. Soc. Mineral. Ital.: 16: 37-100.

O'Neil, J.R. and Taylor, H.P. (1967) The oxygen isotope and cation exchange chemistry of feldspars. American Mineralogist: 52: 1414-1437.

Kastner, M. (1971) Authigenic feldspars in carbonate rocks. American Mineralogist: 56: 1403-1440.

MacKenzie, W.S. and J. Zussman, Eds., The Feldspars (1974). Manchester University Press, U.K.

Willaime, C. and Brown, W.L. (1974) A coherent elastic model for the determination of the orientation of exsolution boundaries: application to the feldspars: Acta Crystallographica: A30: 316-331.

Holdren, G.R., Jr. and Berner, R.A. (1979) Mechanism of feldspar weathering. I. Experimental studies. Geochimica et Cosmochimica Acta: 43: 1161-1171.

Kastner, M. and Siever, R. (1979) Low temperature feldspars in sedimentary rocks. American Journal of Science: 279: 435-479.

Ribbe, P.H., Ed., Feldspar Mineralogy (1983), Reviews in Mineralogy, Mineralogical Society of America, Chantilly, Virginia.

Lehmann, G. (1984) Spectroscopy of feldspars. In: Feldspars and Feldspathoids: Structure, Properties and Occurrences (W.L. Brown, editor). NATO Adv. Study Inst. Ser. C: 421. Reidel Publishing Co., Dordrecht, The Netherlands (121-162).

Parsons, I. and Brown, W.L. (1984) Feldspars and the thermal history of igneous rocks. In: Feldspars and Feldspathoids: Structure, Properties and Occurrences (W.L. Brown, editor). NATO Adv. Study Inst. Ser. C: 421. Reidel Publishing Co., Dordrecht, The Netherlands (317-371).

Hofmeister, A.M. and Rossman, G.R. (1985) A model for the irradiative coloration of smokey feldspar and the inhibiting influence of water. Physics and Chemistry of Minerals: 12: 324-332.

Holdren, G.R., Jr. and Speyer, P.M. (1985) Reaction rate-surface area relationships during the early stages of weathering. I. Initial observations. Geochimica et Cosmochimica Acta: 49: 675-681.

Holdren, G.R., Jr. and Speyer, P.M. (1987) Reaction rate-surface area relationships during the early stages of weathering. II. Data on eight additional feldspars. Geochimica et Cosmochimica Acta: 51: 2311-2318.

Angel, R.J., Hazen, R.M., McCormick, T.C., Prewitt, C.T., and Smyth, J.R. (1988), Comparative compressibility of end-member feldspars. Physics and Chemistry of Minerals: 15: 313-318.

Smith J.V. and Brown, W.L. (1988), Feldspar Minerals. Crystal structures, physical, chemical, and microstructural properties, vl. 1. Springer-Verlage. New York.

Milliken, K.L. (1989) Petrographyand composition of authigenic feldspars. Oligocene Frio formation, south Texas. ournal of Sedimentary Petrology: 59: 361-374.

Murphy, W.M. (1989) Dislocations and feldspar dissolution. European Journal of Mineralogy: 1: 315-326.

Graham, C.M. and Elphick, S.C. (1990) A re-examination of the role of hydrogen in Al-Si interdiffusion in feldspars. Contributions to Mineralogy and Petrology: 104: 481-491.

Mernagh, T. P. (1991): Use of the laser Raman microprobe for discrimination amongst feldspar minerals. Journal of Raman Spectroscopy 22, 453-457.

Angel, R.J. (1994): Feldspars at high pressure. In I. Parsons, Editor, Feldspars and their reactions, NATO ASI series C: 421: 271-312. Kluwer, Dordrecht.

Foland, K.A. (1994) Argon diffusion in feldspars. In: Feldspars and their Reactions (I. Parsons, ed.). NATO Adv. Study Inst. Ser. C, 421. Kluwer Academic Publishers, Dordrecht, The Netherlands.

Spooner, N.A. (1994) The anomalous fading of infrared-stimulated luminescence from feldspars. Radiation Measurements: 23: 625-632.

Johnson, E.A. and Rossman, G.R. (2003) The concentration and speciation of hydrogen in feldspars using FTIR and 1 H MAS NMR spectroscopy. American Mineralogist: 88: 901-911.

Yang, Y., Xia, Q., Zhang, P. (2015): Evolution of OH groups in diopside and feldspars with temperature. Europena Journal of Mineralogy: 27(2): 185-192.

Internet Links for Feldspar Group URL:
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Localities for Feldspar Group

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