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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.



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Pronounciation of Feldspar GroupHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Age informationHide

Age range:
Mesoproterozoic to Carboniferous : 1054 Ma to 311 ± 24 Ma - based on data given below.
Sample ages:
Sample IDRecorded ageGeologic TimeDating method
1311 ± 24 MaPennsylvanianRb-Sr
21054 to 998 MaProterozoicK-Ar
31054 to 998 MaProterozoicK-Ar
Sample references:
IDLocalityReference
1Eibenstock, Erzgebirge, Saxony, GermanyRomer, R. L., & Thomas, R. (2005, January) U-Pb dating of micro-inclusions: The age of the Ehrenfriedersdorf tin deposit (Erzgebirge, Germany). In Mineral Deposit Research: Meeting the Global Challenge (pp. 817-820). Springer Berlin Heidelberg.
2Mutum alkaline complex, Acaraí range, Oriximiná, Pará, BrazilOrris, G. J., Grauch, R. I. (2002) Rare Earth element mines, deposits, and occurenes. USGS Open-File Report 02-189, 1-174.
3  "  "  "  "

Synonyms of Feldspar GroupHide

Other Language Names for Feldspar GroupHide

Bosnian (Latin Script):Feldspat
Catalan:Feldspat
Czech:Živec
Danish:Feldspat
Dutch:Veldspaat
Esperanto:Feldspato
Estonian:Päevakivi
Finnish:Maasälpä
French:Feldspath
Galician:Feldespato
Hungarian:Földpátok
Icelandic:Feldspat
Italian:Feldspato
Japanese:長石
Korean:장석
Latvian:Laukšpats
Lithuanian:Lauko špatas
Norwegian (Bokmål):Feltspat
Norwegian (Nynorsk):Feltspat
Polish:Skaleń
Portuguese:Feldspato
Romanian:Feldspat
Serbian (Cyrillic Script):Фелдспат
Simplified Chinese:长石族
长石
Spanish:Feldespato
Swedish:Fältspat
Turkish:Feldspat

Varieties of Feldspar GroupHide

AntiperthiteAn intergrowth of orthoclase (often as lamellae) enclosed in a plagioclase host. Result of an exsolution process (cf. also perthite).
CryptoperthiteA variety of perthite with lamella of submicroscopic thickness.
MesoperthiteA perthite with approximately equal amounts of alkali feldspar and plagioclase.
PerthiteAn intergrowth of albite or oligoclase with a microcline host, occasionally also with a orthoclase host. The intergrowths or exsolution lamellae of the albite are visible as white lines coursing through the K feldspar groundmass.
Common in granite pegm...

Relationship of Feldspar Group to other SpeciesHide

Group Members:
Albite Na(AlSi3O8)Tric. 1
Amazonite K(AlSi3O8)
Andesine (Na,Ca)[Al(Si,Al)Si2O8]Tric.
Anorthite Ca(Al2Si2O8)Tric. 1 : P1
Anorthoclase (Na,K)AlSi3O8Tric.
Banalsite Na2BaAl4Si4O16Orth.
Buddingtonite (NH4)(AlSi3)O8Mon. 2 : P21
Bytownite (Ca,Na)[Al(Al,Si)Si2O8]Tric.
Celsian Ba(Al2Si2O8)Mon. 2/m
Dmisteinbergite Ca(Al2Si2O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
Filatovite K(Al,Zn)2(As,Si)2O8Mon. 2/m
Hexacelsian BaAl2Si2O8Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm
Hyalophane (K,Ba)[Al(Si,Al)Si2O8]Mon.
Kokchetavite K(AlSi3O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
Kumdykolite Na(AlSi3O8)Orth. mmm (2/m 2/m 2/m) : Pnnm
Labradorite (Ca,Na)[Al(Al,Si)Si2O8]
Microcline K(AlSi3O8)Tric. 1
Oligoclase (Na,Ca)[Al(Si,Al)Si2O8]
Orthoclase K(AlSi3O8)Mon. 2/m : B2/m
Paracelsian Ba(Al2Si2O8)Mon.
Reedmergnerite NaBSi3O8Tric.
Rubicline Rb(AlSi3O8)Tric.
Sanidine K(AlSi3O8)Mon. 2/m : B2/m
Slawsonite Sr(Al2Si2O8)Mon.
Stronalsite Na2SrAl4Si4O16Orth.
Sunstone 
Svyatoslavite Ca(Al2Si2O8)Orth.

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.

Feldspar Group 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 Feldspar GroupHide

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.
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 GroupHide

Significant localities for Feldspar GroupHide

Showing 81 significant localities out of 26,142 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 Province (Badakshan Province; Badahsan Province)
    • Khash & Kuran Wa Munjan Districts
      • Koksha Valley (Kokscha Valley; Kokcha Valley)
[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
[Albite var: Oligoclase] 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
Colombia
 
  • Caldas Department
    • Mun. de Salamina
[Albite var: Andesine] Tassinari, C.C.G., Pinzon, F.D., and Buena Ventura, J. (2008): Ore Geology Reviews 33, 505-518.
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., Laforêt C. (1975), Inventaire minéralogique de la France, Ed. BRGM, n°5, Côtes du Nord, pp: 150-153
  • Provence-Alpes-Côte d'Azur
    • Alpes-de-Haute-Provence
[Anorthite] Favreau G., Meisser N., Chiappero P.J. (2004), Saint-Maime (Alpes-de-Haute-Provence): un exemple de pyrométamorphisme en région provençale, n°3, pp: 59-92
Germany
 
  • Lower Saxony
    • Harz
      • St Andreasberg District
        • St Andreasberg
[Albite var: Zygadite] August Breithaupt (1843) Poggendorff Ann. v 69, p. 441
  • North Rhine-Westphalia
    • Siebengebirge
      • Königswinter
[Sanidine] Nose, K.W., (1808): in Nöggerath, J., Mineralogische Studien über die Gebirge am Niederrhein..., Frankfurt
Israel
 
  • Negev
[Hexacelsian] Galuskina, I.O., Galuskin, E.V., Prusik, K., Vapnik, Y., Dzierżanowski, P. and Murashko,M.(2015)Hexacelsian,IMA2015-045. CNMNC Newsletter No. 27, October 2015, page 1224; Mineralogical Magazine, 79, 1229 –1236.
Italy
 
  • Campania
    • Naples Province
      • Somma-Vesuvius Complex
[Anorthite] Rose. G. (1823): Über den Feldspat, Albit, Labradorit und Anorthit, Annalen der Physik und Chemie, Vol. 73/NF-43, 175-208
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • Ossola Valley
        • Mergozzo
          • Candoglia
[Paracelsian] Tacconi, E. (1905): Di un silicato di alluminio e bario dei calcefiri di Candoglia in valle del Toce. Rendiconti del Regio Istituto Lombardo di Scienze e Lettere, Serie II, 38, 636-643.
  • 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
[Rubicline] D.K.Teertstra, P. Cerny, F.C. Hawthorne, J. Pier, L.M. Wang, C. Ewing (1998) - Rubicline, a new feldspar from San Piero in Campo, Elba, Italy - Am. Min., 83: 1335–1339.
[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]
Japan
 
  • Shikoku Island
    • Kochi Prefecture
      • Kochi City
        • Rendai
[Stronalsite] Bull.Nat.Sci.Mus.Tokyo (1985) ser C, 11, 37-95; Mineralogical Journal Vol. 13 (1986) , No. 6 pp368-375
Kazakhstan
 
  • Akmola Province (Aqmola Oblysy; Akmolinskaya Oblast')
    • Prirechnoye
      • Lake Kumdikol (Lake Kumdykol'; Ozero Kumdykol')
[Kokchetavite] IMA Website
Madagascar
 
  • Tuléar Province (Toliara)
    • Anosy Region (Fort Dauphin Region)
      • Betroka District
        • Mahasoa East 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
    • 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.
Russia
 
  • Far-Eastern Region
    • Kamchatka Oblast'
      • Tolbachik volcano
        • Great Fissure eruption (Main Fracture)
          • Northern Breakthrough (North Breach)
[Filatovite] L.P. Vergasova et al.: Eur. J. Mineral. 16:533-543 (2004)
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
        • Chelyabinsk coal basin
          • Kopeisk
[Dmisteinbergite] ZVMO (1990) 119, n5, 43-45; American Mineralogist (1992) 77, 446-447; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Spain
 
  • Madrid
[Albite] Garcia G., Gonzalez C., Bueno A. (2004) - Cadalso de los Vidrios (Madrid), Bocamina, n° 14, pp: 12-46.
Sweden
 
  • Dalarna
    • Falun
[Albite] Gahn, J.G. & Berzelius, J.J. (1815): Afhandl. Fys. Kem. Min., 4, 180; American Mineralogist (1990) 75, 135.
  • Värmland
    • Filipstad
      • Nordmark district
        • Jakobsberg ore field
[Celsian] GFF (1895) 17, 578; Holtstam, D. & Norrestam, R. (1993): Lindqvistite Pb2MeFe16O27,a novel hexagonal ferrite mineral from Jakobsberg, Filipstad, Sweden. American Mineralogist. 78, 1304-1312
Switzerland
 
  • Wallis (Valais)
    • Bagnes Valley
      • Verbier
[Albite] Erik Vercammen photo & specimen (Bought at the Fiesch-show in 2003)
    • 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)
UK
 
  • Wales
    • Gwynedd
      • Lleyn Peninsula
        • Llanfaelrhys
          • Rhiw
[Banalsite] UK Journal of mines & Minerals, 29, 47-48; Mineralogical Magazine(1944) 27, 33-48;
USA
 
  • California
    • Lake Co.
      • Sulphur Creek District (Sulfur Creek District; Wilbur Springs District)
        • Clear Lake Oaks
[Buddingtonite] Erd, R.C., D.E. White, J.J. Fahey & D.E. Lee (1964), Buddingtonite, an ammonium feldspar with zeolitic water: American Mineralogist: 49: 831, 833; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 279, 360.
    • San Diego Co.
      • Pala District
        • Pala
          • Chief Mountain
            • Elizabeth R. Mine (Hazel W. claim)
[Albite] Mauthner, M. H. F. (2008), The Forty-niner Pocket, Oceanview Mine, Pala District, San Diego County, California. Rocks & Minerals 83(4): 292-297.
  • Colorado
    • Gunnison Co.
      • Willow Creek District
[Albite var: Cleavelandite] The Williamson Southern Group National Collection
    • Park Co.
      • Tarryall
[Microcline var: Amazonite] Jordi Fabre
    • Teller Co.
      • Crystal Peak area
[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
    • Fairfield Co.
      • Redding (Reading)
        • Branchville
[Albite var: Cleavelandite] Cameron et al (1954) USGS Prof Paper 255, Ronald Januzzi collection
      • Trumbull
        • Long Hill
[Albite var: Oligoclase] Harold Moritz collection
    • Litchfield Co.
      • Litchfield
[Albite] Brunet, William M. (1977). Ilmenite Occurrences In Litchfield, Connecticut. Rocks & Minerals: 52(11): 415-20.
      • 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.
      • 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.
[Albite] Yedlin, Neal. (1967). The Micromounter. Rocks and Minerals: 42(11): 840-842.
        • Haddam Neck
[Albite] Mineralogical Magazine 1902 13 : 97-121.; USGS Prof Paper 255; Scovil, Jeffrey A. (1992): Famous Mineral Localities: the Gillette Quarry, Haddam Neck, Connecticut. (Mineralogical Record, 23(1):19-28.)
[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.
[Albite var: Oligoclase] Foye, W. G. (1922): Mineral Localities in the Vicinity of Middletown, Connecticut. (American Mineralogist 7:4-12)
      • Portland
        • Collins Hill
          • Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries)
[Albite] Jenks, William F. (1935): Pegmatites at Collins Hill, Portland, Conn. American Journal of Science: s. 5, 30: 177-197.; Cameron, Eugene N., Larrabee David M., McNair, Andrew H., Page, James T., Stewart, Glenn W., and Shainin, Vincent E. (1954): Pegmatite Investigations 1942-45 New England; USGS Professional Paper 255: 333-338.; Stugard, Frederick, Jr. (1958): Pegmatites of the Middletown Area, Connecticut. USGS Bulletin 1042-Q.
    • Tolland Co.
      • Union
[Albite] Bartsch, Rudolf C. B. (1940): New England Notes. Rocks & Minerals, vol. 15, no. 8, p. 274.
  • 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] 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.
  • New Mexico
    • Otero Co.
[Albite] D.Court collection
  • Oregon
    • Wallowa Co.
[Slawsonite] Am Min 62:31-35
  • Pennsylvania
    • Delaware Co.
      • Middletown Township
[Microcline] Gordon, Mineralogy of Pennsylvania, 1922 p. 190
  • Rhode Island
    • Washington Co.
      • Westerly
        • Bradford
[Albite var: Oligoclase] Miller, C. E. (1971) Rhode Island Minerals and Their Locations, O. D. Hermes, Ed., University of Rhode Island, Kingston
  • 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.
  • Utah
    • Duchesne Co.
[Reedmergnerite] Am Min 45:188-199
Mineral and/or Locality  
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