TAILIEUCHUNG - Applied Clay Mineralogy Phần 4

Đất sét Burley và diaspore đất sét được đặt ở Missouri và phía tây . Các nước khác đất sét chịu nhiệt được sản xuất ở nhiều quốc gia, bao gồm Anh, Đức, Pháp. | Chapter 3 Geology and Location of Major Industrial Clay Deposits 49 Fig. 37. Location of fireclay deposits including underclays and flint clays. grade flint clays occur in the Olive Hill District in Kentucky Patterson and Hosterman 1963 in the Oak Hill District in Ohio Stout et al. 1923 and in the Somerset District in Pennsylvania Hosterman et al. 1968 . High grade flint clays are found in Missouri in the Ozark region Keller et al. 1954 . The locations of these flint clay deposits in Kentucky and Missouri are shown in Fig. 37. Some fireclays in the western United States are Cretaceous in age and are produced in Colorado. Refractory kaolin is produced in Georgia South Carolina Alabama and Idaho. Bauxitic kaolins are located near Andersonville Georgia and Eufaula Alabama. Burley clays and diaspore clays are located in Missouri and western Pennsylvania. . Other Countries Refractory clays are produced in many countries including England Germany France Japan Argentina Australia India Italy Mexico Czech Republic China Russia Poland and Hungary. 4. SMECTITES Smectite minerals are the dominant component in bentonite which is a rock term. Many geologists early in the 20th century recognized that bentonite originated from transported volcanic materials. Ross and Shannon 1926 defined bentonite as follows Bentonite is a rock composed 50 Applied Clay Mineralogy essentially of a crystalline clay-like mineral formed by devitrification and the accompanying chemical alteration of a glassy igneous material usually a tuff or volcanic ash and it often contains variable proportions of accessory crystal grains that were originally phenocrysts in the volcanic glass. These are feldspar commonly orthoclase and oligoclase biotite quartz pyroxenes zircon and various other minerals typical of volcanic rocks. The characteristic clay-like mineral has a micaceous habit and facile cleavage high birefringence and a texture inherited from volcanic tuff or ash and it is usually the mineral .

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