Eastern Europe minerals and mining tenders

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In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form. Minerals are classified by key chemical constituents; the two dominant systems are the Dana classification and the Strunz classification. Silicate minerals comprise approximately 90% of the Earth's crust. Other important mineral groups include the native elements, sulfides, oxides, halides, carbonates, sulfates, and phosphates. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay. Mining is required to obtain most materials that cannot be grown through agricultural processes, or feasibly created artificially in a laboratory or factory.

Eastern Europe is the eastern region of Europe. There is no consistent definition of the precise area it covers, partly because the term has a wide range of geopolitical, geographical, ethnic, cultural, and socioeconomic connotations. Russia, located in Eastern Europe, is both the largest and most populous country of Europe, spanning roughly 40% of the continent's total landmass, with over 15% of its total population. According to the Center for Educational Technologies at Wheeling Jesuit University, there are "almost as many definitions of Eastern Europe as there are scholars of the region". A related United Nations paper adds that "every assessment of spatial identities is essentially a social and cultural construct". One definition describes Eastern Europe as a cultural entity: the region lying in Europe with the main characteristics consisting of East Slavic, Greek, Byzantine, Eastern Orthodox, and some Ottoman cultural influences. Another definition was created during the Cold War and used more or less alike with the term Eastern Bloc. A similar definition names the formerly communist European states outside the Soviet Union as Eastern Europe. Such definitions are often seen as outdated but they are still sometimes used for statistical purposes. Countries in eastern europe, Belarus, Bulgaria, the Czech Republic, Hungary, Moldova, Poland, Romania, Slovakia, Ukraine and the western part of the Russian Federation.