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Petrography is a science which studies different types of rocks in detail. Such a studying is very important for searching mineral resources because the latter ones are the consttituent part of the rocks in the form of bodies of different shape, inclusions, etc. In most of cases the rocks themselves are mineral resources. All the rocks can be devided into the following types according to the conditions of their formation: igneous, sedimentary, and metamorphic. All of these are shown in the exhibition which occupies 16 stands with the exhibits gathered from many coutries of the world.