| Galuskin, E. V., Lazic, B., Armbruster, T., Galuskina, I. O., Pertsev, N. N., Gazeev, V. M., Wlodyka, R., Dulski, M., Dzierzanowski, P., Zadov, A. E., Dubrovinsky, L. S. (2012) Edgrewite Ca9(SiO4)4F2 - hydroxyledgrewite Ca9(SiO4)4(OH)2, a new series of calcium humite-group minerals from altered xenoliths in the ignimbrite of Upper Chegem caldera, Northern Caucasus, Kabardino-Balkaria, Russia. American Mineralogist, 97 (11) 1998-2006 doi:10.2138/am.2012.4161 |