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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 30  1971
Thermal Studies on Pyrophyllite Diaspore Minerals
T. C. RAO, K. V. G. K. GOKHALE AND D. MALHOTRA
Pages : 68-71
DOI : 10.1080/0371750X.1971.10840762
Abstract
PYROPHYLLITE is a hydrated silicate of aluminum with a composition H2Al2 (Si03) 4 Structures of three-layered clays are well understood on the basis of pyrophyllite structure which has also the octohedrally coordinated Al-ions sandwitched between two sheets of linked Si04 tetrahedra. The tetrahedra point inwards and the apical oxygen atoms are a part of the dioctohedral central layer in which two-thirds of the available sites are occupied by AI. Pyrophyllite finds extensive use as a refractory and ceramic material because of its low electrical conductivity (for use in insulators) and high fusion point of its decomposition product (for use in ceramic bodies). It is also commonly used as a filler in paper, rubber, roofing, soap, cosmetics, asbestos products and insecticides such as D.D.T.
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