Пластичная глина

One kind including the organic archery target high fat clay, gives a name richly in Britain. Initially mined when Britain, is advantageous with the horse-drawn vehicle ships, uses its plasticity, rolls the rough ball it, thus is called it. In the world the ball earth's famous habitat is British north west south Devon, north Devon and Dorset. According to the research, the above area's ball earth is when the eocene epoch and the oligocene forms sedimentary mineral deposit (two clay ore deposits). Is mainly composed of the disorderly kleit, and has minerals and so on quartz, mica associated, the organic archery target content reaches as high as 15%, the main chemical composition is SiO2, Al2O3, H2O, H2 and few Fe2O3, TiO2, Na2O, K2O. The color are many and varied, by black, gray primarily. After the roasting, assumes, yellow, the reddish brown white differently along with the foreign inclusion and so on, the nature is soft, stickiness is big, is in the ceramic industry important bonding clay.