Rakushnyak is a rock that is mined in the Crimean deposits. It consists of mollusc shells, which, over time, were densely pressed into one mass. Shell rock is two colors: yellow and white, from which smooth blocks are being sawed out, designed for construction. It is absolutely natural natural material, environmentally friendly and durable, with a porous structure. Reviews of the blocks of shell rock are time-tested, because the material is used in construction for a long time.