Charoitite is a unique rock in the alkaline-carbonatite Murun Complex, Eastern Siberia, Russia with an occurrence of many rare minerals. Here we report a comprehensive summary on mineralogy, major and trace element characteristics of the Ca-(K)-(Na) silicate minerals from charoitites, including charoite, tinaksite, tokkoite, pectolite, fedorite, miserite, agrellite, frankamenite, and hydroxyapophyllite-(K). All these minerals belong to Ca-(K)-(Na) silicates. The content of Al, Fe, and Mg in these silicates is insignificant, though the presence of pyroxene, amphibole, and K-feldspar shows that these elements were present in the system. The high and variable concentration of water, CO₂ and F in the majority of the minerals indicates a hydrous- and volatile-rich environment of crystallization. The trace element data show that rare Ca-(K)-(Na) silicate minerals of charoitites are characterized by relatively low content (typically < 0.1 wt%) of trace elements such as Nb, Ta, Th, U, Zr and Rb. The majority of trace elements likely acted not as structural components defining mineral structures, but as trace impurities. The REE distribution patterns show that LREE enrichment and HREE depletion are characteristic for most of the Ca-(K)-(Na) silicates in charoitite, whereas tokkoite and coarse-grained tinaksite could show HREE enrichment. The REE patterns are characterized by the absence of any significant Eu anomaly, indicating the absence of Eu²⁺ and significant plagioclase fractionation. The initial purple/lilac color of charoite related to Mn can be changed to brown or white color, by weathering and oxidation processes that were associated with the loss of K and Na but retained the trace elements including Mn. The fractionation of trace elements between minerals of charoitites is consistent with their typical geochemical properties and the main reason for the mineralogical diversity of charoitites likely was the limited degree of solid solutions in Ca-(K)-(Na) minerals.