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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

Significant localities for Alkali FeldsparHide

Showing 41 significant localities out of 10,097 recorded on mindat.org.

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 ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Afghanistan
 
  • Badakhshan
    • Khash & Kuran Wa Munjan Districts
      • Koksha Valley (Kokscha Valley; Kokcha Valley)
        • Sar-e Sang (Sar Sang; Sary Sang)
          • Ladjuar Medam (Lajur Madan; Lapis-lazuli Mine; Lapis-lazuli deposit)
[Orthoclase] RWMW Collection
Antarctica
 
  • Eastern Antarctica
    • Victoria Land
      • Ross Island
[Anorthoclase] http://tea.rice.edu/jroberts/12.13.1999.html; Dov Bahat (1979) Anorthoclase Megacrysts: Physical Conditions of Formation. Mineralogical Magazine 43:287-291
Austria
 
  • Carinthia
    • Saualpe
      • Bad Weißenbach
[Orthoclase] G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
  • Lower Austria
    • Waldviertel
      • Waldhausen
[Microcline] R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
Canada
 
  • British Columbia
    • Osoyoos Mining Division
      • Penticton
[Sanidine] Dave Joyce personal collection
  • Québec
    • Abitibi-Témiscamingue
      • La Vallée-de-l'Or RCM
        • Réservoir-Dozois
[Orthoclase] Age of the Cabonga nepheline syenite, Grenville Province, western Quebec Hudon, Pierre; Friedman, Richard M.; Gauthier, Gilles; Martignole, Jacques Canadian Journal of Earth Sciences, vol. 43, issue 9, pp. 1237-1249 Olivier Langelier Collection; Hudon, P., Friedman, R.M., Gauthier, G. & Martignole, J. (2006) Age of the Cabonga nepheline syenite, Grenville Province, western Quebec. Canadian Journal of Earth Sciences, vol. 43(9), 1237-1249.
Ethiopia
 
  • Southern Nations Nationalities and Peoples' Region
[Microcline var: Amazonite] Kaiser, H. (2006): Amazonit aus Äthiopien-Kristalle injutesäcken. ExtraLapis 30: 72-73
France
 
  • Auvergne-Rhône-Alpes
    • Loire
      • Montbrison
        • Essertines-en-Châtelneuf
[Microcline] F. Gonnard (1906) - Minéralogie des départements du Rhône et de la Loire, pp: 6 & 36
    • Rhône
      • Beaujeu
        • Les Ardillats
[Orthoclase] Favreau G., Legris J-R., Dardillac M. (1996), La Verrière (Rhône): Histoire et Minéralogie, Le Cahier des Micromonteurs, n°3, pp:3-28
  • Brittany
    • Côtes-d'Armor
      • Saint-Jacut-de-la-Mer
[Microcline] Pierrot, R., Chauris, L., and Laforêt, C. (1975) Inventaire minéralogique de la France. Ed. BRGM, n°5, Côtes du Nord, 150-153.
Germany
 
  • North Rhine-Westphalia
    • Siebengebirge
      • Königswinter
[Sanidine] Nose, K.W. (1808) in Nöggerath, J., Mineralogische Studien über die Gebirge am Niederrhein..., Frankfurt.; Krul, H. (1969) Geologische zwerftochten. N.V. W.J. Thieme & Cie - Zutphen, Netherlands, 161 pp. (in Dutch).
Italy
 
  • Sicily
    • Trapani Province
[Anorthoclase] [Foerstner] Förstner H. (1877): Ueber die Natronorthoklas von Pantelleria. Zeits. Kryst. Min., 1, 1, 547-561; Foerstner E. [H.] (1881): Nota preliminare sulla geologia dell'isola di Pantelleria secondo gli studi fatti negli anni 1874 e 1881. Boll. R. Comit. Geol. Ital., 12, 523-556;[Foerstner] Förstner H. (1884): Ueber die Feldspäthe von Pantelleria. Zeits. Kryst. Min., 8, 1, 125-202; Foerstner H. (1884): Ueber künstliche physikalische Veränderungen der Feldspäthe von Pantelleria. Zeits. Kryst. Min., 9, 1, 333-352; Rosenbusch H. (1885): Mikroschopische Physiographie der Mineralien und Gesteine. Ein Hülfsbuch bei mikroskopischen Gesteinsstudien. Band I. Die petrographisch wichtigen Mineralien. Zweite gänzlich umgearbeitete Auflage. E. Schweizerbart’sche Verlagshandlung (E. Koch), Stuttgart, 664 pp.; Bahat D. (1979): Anorthoclase megacrysts: physical conditions of formation. Mineralogical Magazine, 43, 287-291; Civetta L., D’Antonio M., Orsi G., Tilton G.R. (1998): The geochemistry of volcanic rocks from Pantelleria Island, Sicily Channel: petrogenesis and characteristics of the mantle source region. Journ. Petrology, 1453-1491.
  • Tuscany
    • Livorno Province
      • Elba Island
        • Campo nell'Elba
          • San Piero in Campo
[Orthoclase] Barsotti, G., & Nannoni, R. (2006). Rocce, minerali e miniere delle isole dell'Arcipelago Toscano. Pacini editore, 152 pp.
[Orthoclase] Barsotti, G., & Nannoni, R. (2006). Rocce, minerali e miniere delle isole dell'Arcipelago Toscano. Pacini editore, 152 pp.
          • Sant'Ilario in Campo
[Orthoclase]
Madagascar
 
  • Anosy
    • Betroka District
      • Mahasoa Est Commune
[Sanidine] Ackermann, S., Kunz, M., Armruster, T., Schefer, J. & Hanni, H. (2005): Cation distribution in a Fe-bearing K-feldspar from Itrongay, Madagascar. A combined neutron- and x -ray single crystal diffraction study. Lawrence Berkeley National Labroatory- http://www.escholarship.org/uc/item/20f968sx http://www.mindat.org/mesg-7-219075.html
Namibia
 
  • Erongo Region
    • Dâures
      • Brandberg Area
        • Messum Igneous Complex
[Microcline] Peter Seroka collection. Bezing, L. von, Bode, R. & Jahn, S. (2008): Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern: 270 (in English)
Norway
 
  • Aust-Agder
[Microcline] Breithaupt, A. (1830): Ueber die Felsite und einige neue Specien ihres Geschlechts. Journal für Chemie und Physik, 60: 316-330
  • Vestfold
    • Larvik
[Microcline] Breithaupt, A. (1830): Ueber die Felsite und einige neue Specien ihres Geschlechts. Journal für Chemie und Physik, 60: 316-330; Larsen, K. E. (2015): Mikroklin- et mineral førstegangsbeskrevet fra Norge. Stein 42 (4), 9-11.
Switzerland
 
  • Wallis (Valais)
    • Binn Valley
      • Fäld (Imfeld; Im Feld; Feld)
[Microcline var: Hyalophane] Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 217-218; American Mineralogist 68, 112 (1983)
USA
 
  • Colorado
    • Park Co.
      • Tarryall
[Microcline var: Amazonite] Jordi Fabre
    • Teller Co.
      • Crystal Peak
[Microcline var: Amazonite] Specimen from Joe Dorris collection exhibited at Tucson show 2008; Joseph Dorris (2015) Amazomite and Smoky Quartz Mining on the Smoky Hawk Claim, Teller County, Colorado. 36th Annual New Mexico Mineral Symposium pp. 11-12.
  • Connecticut
    • Litchfield Co.
      • Morris
[Microcline] W.C. van Laer: field notes, 1977; Yale Peabody Museum collection
      • Thomaston
[Microcline] Januzzi, Ronald E. and David Seaman. (1976), Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut.
    • Middlesex Co.
      • East Hampton (Chatham)
        • Airline Railroad
[Microcline] Schooner, Richard. (1958), The Mineralogy of the Portland-East Hampton-Middletown-Haddam Area in Connecticut (With a few notes on Glastonbury and Marlborough). Published by Richard Schooner; Ralph Lieser of Pappy’s Beryl Shop, East Hampton; and Howard Pate of Fluorescent House, Branford, Connecticut.; Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut mineralogy.
      • Haddam
[Microcline] Williams, Horace S. (circa 1945): Article for New York Society of Mineralogists. Brainerd Public Library, Haddam, Connecticut.; Ryerson, Kathleen. (1972): Rock Hound's Guide to Connecticut. Pequot Press.; Webster, Bud. (1978): Mineral Collector’s Field Guide Connecticut.
        • Haddam Neck
[Microcline] Davis, James W. (1901): The Minerals of Haddam, Conn. Mineral Collector, v. 8, no. 4, pp. 50-54, and no. 5, pp. 65-70.; Mineralogical Magazine 1902 13 : 97-121.; Cameron, Eugene N. and others. (1954) PEGMATITE INVESTIGATIONS 1942-45 NEW ENGLAND. U.S. Geological Survey, Professional Paper 255; Scovil, Jeffrey A. (1992): Famous Mineral Localities: the Gillette Quarry, Haddam Neck, Connecticut. (Mineralogical Record, 23(1):19-28.); Stugard, Frederick, Jr. (1958) PEGMATITES OF THE MIDDLETOWN AREA, CONNECTICUT. USGS Bulletin 1042-Q.
[Microcline] Harold Moritz collection
[Microcline var: Amazonite] Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 403
[Microcline var: Hyalophane] Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut minerals.
  • Idaho
    • Boise Co.
[Microcline] Ted Johnson Collection
  • Maine
    • Oxford Co.
      • Albany
[Microcline] Barry Heath and Frank Perham; King, V. (ed.), 2009, Maine feldspar, Families, and Feuds.
  • Massachusetts
    • Essex Co.
      • Gloucester
[Microcline var: Amazonite] P Cristofono collection , 2009
  • Montana
    • Flathead Co.
      • Hog Heaven District (Flathead District)
        • Kofford Ridge
[Sanidine] Ray Lasmanis
  • New Jersey
    • Sussex Co.
      • Franklin mining district
        • Franklin
          • Franklin Mine
[Microcline] Peters, et al: The Minerals of the Buckwheat Dolomite, Franklin, NJ: Mineralogical Record:14:183-194; Dunn(1995):Pt4:510.
[Microcline] Palache(1935):16 & 60; Dunn(1995):Pt1:133.
  • Pennsylvania
    • Delaware Co.
      • Middletown Township
[Microcline] Gordon, Mineralogy of Pennsylvania, 1922 p. 190
  • Texas
    • Llano Co.
      • Kingsland Granite Company Quarry (Petrick Quarry)
[Microcline] Self-collected by Franklin Roberts.; Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.
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