Герасимовский, В. И. Пегматиты Ловозерского щелочного массива / В. И. Герасимовский. - Москва : Издательство Академии наук СССР, 1939. - 44, [2] с. : ил. - (Труды Института геологических наук ; Минералого-геохимическая серия ; вып. 18 ; № 5).

sive. The bulk of pegmatites is characterized by the occurrence in them of eudia- lyte and sodium titano-silicates. These pegmatites are very near in mineralo- gical composition to those of the Khibina alkaline massive. The other lesser group of pegmatites (the orthoclase type with ilmenite and sphene) is charac­ terized by minerals containing Ca (sphene, apatite, fluorite) and Ti (ilmenite and sphene), the sodium titano-silicates being usually absent. These pegmati­ tes are confined to rocks with the agpaitic coefficient about a un it, and in mi- neralogical composition are very near to the pegmatites of the Ilmen alkaline massive. In the Lovozero pegmatites a number of interesting replacements of some minerals by others are observed: 1) of microcline — by albite; 2) of nephe- line — by sodalite; 3) of hackmanite and microcline — by ussingite; 4) of nepheline, hackmanite, sodalite and microcline — by zeolites; 5) of aenigftia- tite — by astrophyllite; G) of eudialyte — by catapleite, and 7) of nepheli­ ne — by cancrinite. In addition to the description of pegmatites, the paper presents a brief characteristic also of their minerals. In the formation of these minerals 41 elements take part, counting nil the rare-earth elements (with the exception of yttrium) for one element (See. Fig. 5). The pegmatites of the Lovozero alkaline massive contain a number of m i­ nerals unknown in other localities (with the exception of the Kola peninsula) — cliinglusuite, lamprophyllite, ramsayite, murmanite and loparite. In addition, such rare minerals as ussingite, scliizolite, steenstrupin, erikite, etc. are obser­ ved in them.