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Oltu Stone is a special sedimentary rock extracted from the Oltu district of Erzurum and also known as “Black Amber.” It occurs in lens-shaped layers within Neogene-aged rock strata, appearing in thin beds and sometimes containing plant fossils. How Is It Extracted and Processed? When extracted from the soil, it is soft; however, it hardens rapidly upon exposure to air. Therefore, it is preserved in a moist environment until it is ready for carving. It is traditionally extracted from galleries a