| 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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