(Ba,V) micas are rather rare [5]. Reports about theiroccurrence in the Urals are unknown to date [1, 8]. Wefound these micas in igneous and metamorphic rocks ofthe Il’menskie Gory (Ilmeny Mountains) Complex andits framework in the southern Urals.Two biotite varieties with different Ba contents wererevealed in boulders of the coarse-grained biotite–amphibole subalkaline gabbro in a serpentinitemelange sheet in the Osinovyi Mys (Promontory) areaon the eastern coast of Lake Greater Ishkul (Ilmenyreserve).The moderately Ba-rich biotite occurs in theinequigranular to porphyritic holocrystalline rock(sample IK-194-5). Biotite with a higher Ba content isobserved in another boulder of biotite–amphibole gab-bro with distinct ophitic texture. The composition,structure, and appearance of this rock indicate its intru-sive origin [3].Euhedral biotite flakes, 1–3 mm across, occur atboundaries of plagioclase and amphibole grains (Fig. 1)and as inclusions within these minerals. The inductionstriation developed in some cases testifies to the synchro-nous crystallization of biotite, amphibole, and plagio-clase. The content of biotite in the rock is less than 10%.Despite similar bulk mineral and chemical composi-tions of gabbro in the aforementioned two bouldersfrom the serpentinite melange in the Osinovyi Mysarea, they differ in compositions of feldspars, amphib-ole, apatite, magnetite, and biotite. The biotite is char-acterized by sharply variable BaO contents (Table 1). Interms of other parameters, both biotites represent theTi- and Mg-rich variety [7] with a significant role ofFe