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Alkali Feldspar

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About Alkali FeldsparHide

Feldspar Group minerals rich in Potassium or Sodium.



Age distributionHide

Recorded ages:
Miocene : 20 ± 1.2 Ma to 14.5 ± 0.4 Ma - based on 6 recorded ages.

Other Language Names for Alkali FeldsparHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz14 photos of Alkali Feldspar associated with Quartz on mindat.org.
Lamprophyllite1 photo of Alkali Feldspar associated with Lamprophyllite 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.

Alkali Feldspar in petrologyHide

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

References for Alkali FeldsparHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Yund, R.A. (1974) Coherent exsolution in the alkali feldspars. In A.W. Hofmann, B.J. Giletti, H.S. Yoder, Jr., R.A. Yund, Eds., Geochemical Transport and Kinetics. Carnegie Institution of Washington publication 634: 173-183.
Yund, R.A. and Tullis, J. (1983) Subsolidus phase relations in the alkali feldspars with emphasis on coherent phases. In P.H. Ribbe, Ed., Feldspar Mineralogy, 2: 141-176. Reviews in Mineralogy, Mineralogical Society of America, Chantilly, Virginia.
Yund, R.A. (1984) Alkali feldspar exsolution: kinetics and dependence on alkali interdiffusion. In: Feldspars and Feldspathoids: Structure, Properties and Occurrences (W.L. Brown, ed.) NATO Adv. Study Inst. Ser. C 137. Reidel Publishing Co., Dordrecht, The Netherlands (281-315).
Fleet, M.E. (1986) Lattice theory and transformation twinning in alkali feldspar. Canadian Mineralogist: 24: 615-623.
Su, Shu-Chun, Ribbe, P.H., and Bloss, F.D. (1986) Alkali feldspars: structural state determined from composition and optic axial angle 2V. American Mineralogist: 71: 1285-1296.
Hovis, G.L. (1988) Enthalpies and volumes related to K-Na mixing and Al-Si order/disorder in alkali feldspars. Journal of Petrology: 29: 731-763.
Parsons, I., Rex, D.C., Guise, P., and Halliday, A.N. (1988) Argon-loss by alkali feldspars. Geochimica et Cosmochimica Acta: 52: 1097-1112.
Worden, R.H., Walker, F.D.L., Parsons, I., and Brown, W.L. (1990) Development of microporosity, diffusion channels and deuteric coarsening in perthitic alkali feldspars. Contributions to Mineralogy and petrology: 104: 507-515.
Evangelakakis, C., Kroll, H., Voll, G., Wenk, H.-R., Meisheng, H., and Kopcke, J. (1993) Low-temperature coherent exsolution in alkali feldspars fro high-grade metamorphic rocks of Sri Lanka. Contributions to Mineralogy and Petrology: 114: 519-532.
Waldron, K.A., Lee, M.R., and Parsons, I. (1994) The microstructure of perthitic alkali feldspars revealed by hydrofluoric acid etching. Contributions to Mineralogy and petrology: 116: 360-364.
Lee, M.R. and Parsons, I. (1995) Microtextural controls of weathering of perthitic alkali feldspars. Geochimica et Cosmochimica Acta: 59: 4465-4488.
Walker, F.D.L., Lee, M.R., and Parsons, I. (1995) Micropores and micropermeable texture in alkali feldspars: geochemical and geophysical implications. Mineralogical Magazine: 59: 505-534.
Kontak, D.J., Martin, R.F., and Richard, L. (1996) Patterns in phosphorus enrichment in alkali feldspar, South Mountain batholith, Nova Scotia, Canada. European Journal of Mineralogy: 8: 805-824.
Lee, M.R. and Parsons, I. (1997) Compositional and microtextural zoning in alkali feldspars from the Shap granite and its geochemical implications. Journal of the Geological Society of London: 154: 183-188.
Lee, M.R. and Parsons, I. (1997) Dislocation formation and albitization in alkali feldspars from the Shap granite. American Mineralogist: 82: 557-570.
Lee, M.R., Hodson, M.E., and Parsons, I. (1998) The role of intragranular microtextures and microstructures in chemical and mechanical weathering: direct comparison of experimentally and naturally weathered alkali feldspars. Geochimica et Cosmochimica Acta: 62: 2771-2788.
Parsons, I., Brown, W.L., and Smith, J.V. (1999) 40Ar/39Ar thermochronology using alkali feldspars: real thermal history or mathematical mirage of microtexture Contributions to Mineralogy and Petrology: 136: 92-110.
Visocekas, R. and Zink, A. (1999) Use of the far infrared TL emission band of alkali feldspars for dosimetry and dating. Quaternary Sci. Rev.: 18: 271-278.
Parsons, I., Thompson, P., Lee, M.R., and Cayzer, N. (2005) Alkali feldspar microtextures as provenance indicators in siliciclastic rocks and their role in feldspar dissolution during transport and diagenesis. Journal of Sedimentary Research: 75: 921-942.
Fitz Gerald, J.D., Parsons, I., and Cayzer, N. (2006) Nanotunnels and pull-aparts: defects of exsolution lamellae in alkali feldspars. American Mineralogist: 91: 772-783.

Internet Links for Alkali FeldsparHide

Localities for Alkali FeldsparHide

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

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