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Alkali Feldspar

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Feldspar Group minerals rich in Potassium or Sodium.

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Age informationHide

Age range:
Miocene : 20 ± 1.2 Ma to 14.5 ± 0.4 Ma - based on data given below.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
114.5 ± 0.4 MaMioceneK-Ar
218.1 ± 0.5 MaMioceneK-Ar
318.2 ± 0.6 MaMioceneK-Ar
419.7 ± 0.1 MaMioceneK-Ar
519.9 ± 0.6 MaMioceneK-Ar
620 ± 1.2 MaMioceneK-Ar
Sample references:
1Tonopah District, San Antonio Mts, Nye Co., Nevada, USASilberman, M. L., Bonham, H. F. Jr., Garside, L. J., Ashley, R. P. (1978) Radiometric ages of volcanic and plutonic rocks and hydrothermal alteration-mineralization in the Tonopah Mining District and vicinity, Nye and Esmerelda Counties, Nevada. United States Department of the Interior Geological Survey Open-File Report 78-841. 1-48.
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Other Language Names for Alkali FeldsparHide

Common AssociatesHide

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

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

References for Alkali FeldsparHide

Reference List:
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Smith, J.V., 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., Tullis, J. (1983) Subsolidus phase relations in the alkali feldspars qwith 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., 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., Halliday, A.N. (1988) Argon-loss by alkali feldspars. Geochimica et Cosmochmica Acta: 52: 1097-1112.
Worden, R.H., Walker, F.D.L., Parsons, I., 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., 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., 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., 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., Parsons, I. (1995) Micropores and micropermeable texture in alkali feldspars: geochemical and geophysical implications. Mineralogical Magazine: 59: 505-534.
Lee, M.R., 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., 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., Parsons, I. (1998) The role of intragranular microtextures and microstructures in chemical and mechanical weathering: direct comparison of expermentally and naturally weathered alkali feldspars. Geochimica et Cosmochmica Acta: 62: 2771-2788.
Parsons, I., Brown, W.L., 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., 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., 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., 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

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