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Clay slate This is a hard clay rocka natural shaly addition, greenish, reddish, black, dark gray. This shale occurs in very ancient geological deposits. It is a modified and compacted by later metamorphic processes and pressure clay. In a homogeneous mass of slate, grains of calcareous spar, veins of quartz, crystals of sulfur pyrite are often produced. Under the microscope, you can also see the needles of rutile, mica leaves and less common minerals. According to the mineralogical composition, physical properties and structure, slate is distinguished: - penetrated by sulfur pyrite and carbonaceous matter - alum slate; - rich in carbonaceous matter - drawing shale; - enriched with silica - grinding shale; - spilling on long posts - slate; - slate; - shale slate. In Russia, the most useful sorts of clay shale are known in Olonets province, the Urals, Caucasus, Ukraine. Clay shale is used as a slate, roofing and facing material. Crystalline slateThis name was taken for a group of regionally metamorphosed rocks. They have a complete crystalline structure. Slate is represented only by dark-colored minerals, either quartz or feldspars.Crystalline shales are used as refractory raw materials, as well as building material. Application Slate, or as it is often called, natural slate is a natural material used in construction still from the Middle Ages. Slant is quite a different stone in terms of properties and appearance. That's why with its help you can create unusual interiors. Often, crystalline shale is used in construction, where it is used as a roofing material and for the production of facing materials. The use of shale as a building material is accepted not only due to the ease of processing and accessibility of the stone, but also because it excellently affects the human body. , the construction of which used slate, become for their residents a real health resort: the stone treats many nervous disorders, helps to get rid of insomnia, favorably affects the e otsionalnoe condition, relieves tension and stress. Slate approaches almost all the signs of the zodiac, excluding the Capricorn and Aries. The most favorable stone is the Cancer and the Pisces.