White dense kenyaite (Na2Si22O41(OH)8 6H2O) nodules were found by enthusiasts in dumps of exploration mines of the Rechnoe cacholong occurrence in the Adamovsky district of the Orenburg region. The nodules occurred among eroded black shales and contained small aggregates of maga-diite NaSi7O13(OH)3 · H2O. Apparently, this is the frst fnding of kenyaite and magadiite in Russia.

Figures 9. Tables 3. References 12.

Key words: kenyaite, magadiite, southern Urals.

M.V. Shtenberg, Institute of Mineralogy UB RAS, Miass; shtenberg@mineralogy.ru

V.A. Popov,  Institute of Mineralogy UB RAS, Miass;

S.M. Lebedeva,  Institute of Mineralogy UB RAS, Miass;

E.D. Zenovich, Institute of Mineralogy UB RAS, Miass;

N.A. Bozhko, Institute of Mineralogy UB RAS, Miass;

1. Beneke K., Lagaly G. (1983) Kenyaite-synthesis and properties. American Mineralogist, 68, 818–826.
2. Chukanov N.V. (2014) Infrared spectra of mineral species Extended library. Dordrecht: Springer Netherlands: Imprint: Springer, 1726 p.
3. Eugster H.P. (1967) Hydrous sodium silicates from Lake Magadi, Kenya: precursors of bedded chert. Science, 157(3793), 1177–1180.
4. Eugster H.P., Jones B.F., Sheppard R.A. (1967) New hydrous sodium silicates from Kenya, Oregon and California: possible precursors of chert. (abstr.). Geological Society of American Annual Meeting, 60.
5. Eugster H.P. (1969) Inorganic bedded cherts from the Magadi area, Kenya. Contribution to Mineralogy and Petrology, 22, 1–31.
6. Götze J., Nasdala L., Kleeberg R., Wenzel M. (1998) Occurrence and distribution of «moganite» in agate/chalcedony: a combined micro-Raman, Rietveld, and cathodoluminescence study. Contribution to Mineralogy and Petrology, 133, 96–105.
7. Huang Y., Jiang Z., Schwieger W. (1999) Vibrational spectroscopic studies of layered silicates. Chemical Materials, 11, 1210–1217.
8. Lagaly G., Beneke K. Weiss A. (1975) Magadiite and H-magadiite: I. Sodium magadiite and some of its derivatives. American Mineralogist, 60, 642–649.
9. McAtee J.L., House R., Eugster H.P. (1968) Magadiite from Trinity county, California. American Mineralogist, 53, 2061–2069.
10. McCulloch L. (1952) A new highly silicious soda–silica compound. Journal of American Chemical Society, 74(10), 2453–2456.
11. Rodgers K.A., Hampton W.A. (2003) Laser Raman identification of silica phases comprising microtextural components of sinters. Mineralogical Magazine, 67(1), 1–13.
12. Schmidt P., Bellot-Gurlet L., Slodczyk A., Fröhlich F. (2012) A hitherto unrecognised band in the Raman spectra of silica rocks: Influence of hydroxylated Si–O bonds (silanole) on the Raman moganite band in chalcedony and flint (SiO2). Physics and Chemistry of Minerals, 39, 455–464.