Lithuanian–Muscovite War (1368–1372) fight. The episode with the spear was probably borrowed from Polish historiography: King Boleslaus I of Poland used his sword (Szczerbiec) to hit the Golden Gate in Kiev in 1018. Lithuanian–Muscovite War (1368–1372) The Lithuanian–Muscovite War encompasses three raids by Algirdas, Grand Duke of Lithuania, to the Grand Duchy of Moscow in 1368, 1370, and 1372. Algirdas organized the raids against Dmitry Donskoy in support of the Principality of Tver, chief rival of Moscow. In 1368 and 1370, Lithuanians besieged Moscow and burned the posad, but did not succeed in taking the city's Kremlin. In 1372, the Lithuanian army was
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