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Alkali Feldspar

Synonym of:Albite, Anorthoclase, Microcline, Orthoclase, Sanidine


Feldspar Group minerals rich in Potassium or Sodium.

Classification of Alkali Feldspar

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Other Information

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

References for Alkali Feldspar

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.

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 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. (1986b) 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 Cosmochmica 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.

Lee, M.R. and Parsons, I. (1997a) 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. (1997b) 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 expermentally and naturally weathered alkali feldspars. Geochimica et Cosmochmica 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.

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    Localities for Alkali Feldspar

    Hide Locality List
    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • Queensland
    		Carr, Phillips & Williams - Min.Mag. 1976 40,853-6
    • South Australia
      • Mt Lofty Ranges
        • South Mt Lofty Ranges
          • Palmer
    		South Australian Museum collection
    • Western Australia
      • West Musgrave Block
    		Mineral. Deposita 42 (2007) 551-581.
    Channel Islands
     
    • Jersey
    		Ch. Wagner and D. Velde, Bull. Minéral. , 1985, 108, pp. 173-187.
    Finland
     
    • Etelä-Suomen Lääni
      • Southern Karelia
        • Wiborg
    		C. Lemanski, Jr. (re-entry of lost Mindat data).
    C. Lemanski, Jr. (re-entry of lost Mindat data).
    C. Lemanski, Jr. (re-entry of lost Mindat data).
    C. Lemanski, Jr. (re-entry of lost Mindat data).
    C. Lemanski, Jr. (re-entry of lost Mindat data).
    • Länsi-Suomen Lääni
      • Eurajoki
    		C. Lemanski, Jr. (re-entry of lost Mindat data).
    C. Lemanski, Jr. (re-entry of lost Mindat data).
    Italy
     
    • Tuscany
      • Grosseto Province
        • Pitigliano
    		F. Stoppa and Y. Liu, Eur. J. Mineral. , 1995, 7, pp. 391-402.
    Japan
     
    • Shikoku Island
      • Kochi Prefecture
        • Tosashimizu City
    		Kazuo Nakashima and Teruyoshi Imaoka (1998) Mineralogy and Petrology, 63, #1-2, 1-17.
    Namibia
     
    • Erongo Region
      • Karibib District
        • Okatjimukuju farm (Friedrichsfelde farm)
    		P. Keller and O. von Knorring, Eur. J. Mineral. , 1989, 1, pp. 567-593.
    Norway
     
    • Østfold
      • Halden
        • Idd
          • Aspedammen
    		Neumann, H. & Sverdrup, T.L.(1959):"Contribution to the Mineralogy of Norway No. 3. Bavenite from Boksjøen mineral mine, near Aspedammen in the country of Østfold". Norsk Geologisk Tidsskrift 39,339-342
    • Vestfold
      • Larvik
    		Widenfalk, L. & Gorbatschev, R. (1971): Contribution to the mineralogy of Norway , No. 43. A note on a New Occurence of Baddeleyite in Larvikite from Larvik, Norway. Norsk Geologisk Tidsskrift 51, 193-194
      • Sandefjord
        • Lahellefjorden
    		Berge, S.A. & Larsen,A.O.(1980): Mineraler fra Sandefjordsområdet-IV.Granater".NAGS-nytt 7(2),21-24. (in norwegian)
    Berge, S.A. & Larsen,A.O.(1980): Mineraler fra Sandefjordsområdet-IV.Granater".NAGS-nytt 7(2),21-24. (in norwegian)
    USA
     
    • Alaska
      • Prince of Wales-Outer Ketchikan Borough
        • Prince of Wales Island
    		Min Mag (1993) VOL 57, PP. 743-746
    • Texas
      • Hudspeth Co.
        • Corudas Mts
    		Can Min 6:399-402
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 7th Nov 2009 20:39:05