“…From recalculation of hundreds of analyses, Yaroshevsky and Bagdasarov (2007) proposed a ratio nal systematics for this group, where the entire diver sity of structural-chemical varieties is reduced to four mineral species: labuntsovite, niobolabuntsovite, nenadkevichite, and titanonenadkevichite. The eudi alyte group includes only 4 mineral species and about 30 structural-chemical varieties (Bulakh, 2004;Borutsky, 2007;Yaroshevsky and Bagdasarov, 2007). Even in the modern and popular reference book, e.g., Strunz and Nickel (2001), a significant part of varieties appears in the list of mineral species, often under own names.…”