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Buddingtonite is an ammonium feldspar with formula: NH₄AlSi₃O₈ (note: some sources add 0.5H₂O to the formula). It forms by hydrothermal alteration of primary feldspar minerals. It is an indicator of possible gold and silver deposits, as they can become concentrated by hydrothermal processes. It crystallizes in the monoclinic crystal system and is colorless to white with a vitreous luster. Its structure is analogous to that of high sanidine (KAlSi₃O₈). Buddingtonite has a hardness of 5.5 and a specific gravity of 2.32.

Buddingtonite was discovered in 1964 at the Sulfur Bank mine near Clear Lake in Lake County, California. Clear Lake is at the north end of The Geysers geothermal area. It also occurs in the Tonopah, Nevada area and in hydrothermal areas in New Zealand and Japan. It has also been reported from the sedimentary Phosphoria Formation in Idaho, South Dakota, Wyoming, and Montana. It occurs in the oil shale deposit, near Proserpine, Queensland, Australia.

It was named for Arthur Francis Buddington (1890–1980), a petrologist at Princeton University.

References

1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
2. Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Buddingtonite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Retrieved 14 March 2022.
3. "Buddingtonite". Mindat.org. Retrieved 13 June 2022.
4. Webmineral data
5. Mookherjee, M.; Redfern, S. A. T.; Swainson, I.; Harlov, D. E. (December 2004). "Low-temperature behaviour of ammonium ion in buddingtonite from neutron powder diffraction". Physics and Chemistry of Minerals. 31 (9): 643–649. Bibcode:2004PCM....31..643M. doi:10.1007/s00269-004-0425-8. hdl:2027.42/46909. S2CID 47007808.
6. Erd RC, White DE, Fahey JJ, Lee DE (1964). "Buddingtonite, an ammonium feldspar with zeolitic water". American Mineralogist. 49 (7–8): 831–50.
7. Felzer B, Hauff P, Goetz AFH (1994). "Quantitative reflectance spectroscopy of buddingtonite from the Cuprite mining district, Nevada". Journal of Geophysical Research. 99 (B2): 2887–95. Bibcode:1994JGR....99.2887F. doi:10.1029/93JB02975.
8. Yang K, Browne PRL, Huntington JF, Walshe JL (2001). "Characterizing the hydrothermal alteration of the Broadlands-Ohaaki geothermal system, New Zealand, using short-wave infrared spectroscopy". Journal of Volcanology and Geothermal Research. 106 (1–2): 53–65. Bibcode:2001JVGR..106...53Y. doi:10.1016/S0377-0273(00)00264-X.
9. Gulbrandsen RA (1974). "Buddingtonite, ammonium feldspar, in the Phosphoria Formation, southeastern Idaho". USGS Journal of Research. 2 (6): 693–7.
10. Solomon GC, Rossman GR (1988). "NH₄ in pegmatitic feldspars from the southern Black Hills, South Dakota". American Mineralogist. 73: 818–21.
11. Loughan FC, Roberts FI, Linder AW (1983). "Buddingtonite (NH₄-feldspar) in the Condor Oilshale Deposit, Queensland, Australia". Mineralogical Magazine. 47 (344): 327–34. Bibcode:1983MinM...47..327L. doi:10.1180/minmag.1983.047.344.07. S2CID 140724010.

Other reading

• Voncken JHL, van Roermund HLM, van der Eerden AMJ, Jansen JBH, Erd RC (1993). "Holotype buddingtonite, an ammonium feldspar without zeolitic H₂O". American Mineralogist. 78: 204–209. Retrieved 13 June 2022.
• Voncken JHL, Konings RJM, Jansen JBH, Woensdregt CF (1988). "Hydrothermally grown buddingtonite, an anhydrous ammonium feldspar (NH₄AlSi₃O₈)". Physics and Chemistry of Minerals. 15 (4): 323–328. Bibcode:1988PCM....15..323V. doi:10.1007/BF00311036. S2CID 93352487.

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