Muscovite–Volga Bulgars war (1376) Muscovite–Volga Bulgars war (1376) The Muscovite-Volga Bulgars War of 1376 was organized by Russian Prince Dmitry Donskoy of Moscow, and Dmitry Konstantinovich of Vladimir-Suzdal. The Moscow-Nizhny Novgorod combined army was led by Moscow Governor Dmitry Mikhailovich Bobrok Volynskyy, and sons Dmitry Suzdal Vasily and Ivan. Volga Bulgaria, which was at the time an of the Golden Horde (who had converted to Islam in 1313), was ruled by emir Hassan Khan (in Russian chronicles - Assan) and Horde Protégé Muhammad Sultan (Sultan Mahmat). In 1364, ongoing raids perpetrated by the Mongol-Tatars on Nizhny Novgorod land forced Prince Dmitry Konstantinovich of Nizhegorodsko-Suzdal
Muscovite and can be transparent or translucent. It is anisotropic and has high birefringence. Its crystal system is monoclinic. The green, chromium-rich variety is called fuchsite; mariposite is also a chromium-rich type of muscovite. Muscovite is the most common mica, found in granites, pegmatites, gneisses, and schists, and as a contact metamorphic rock or as a secondary mineral resulting from the alteration of topaz, feldspar, kyanite, etc. In pegmatites, it is often found in immense sheets that are commercially valuable. Muscovite is in demand for the manufacture of fireproofing and insulating materials and to some extent as a lubricant. The name