Talc Structure Research Articles

Studies on Indian Talcs

The structure of talc, its properties and effect of heat on its various properties have been discussed in the form of survey of literature. Three different samples of talc from different localities viz. Udaipur, Jaipur and Rupaund were taken and their various properties have been studied. The properties investigated include chemical analysis, differential thermal analysis, petrological studies and particle size distribution of powdered talc samples. The effect of heat on these samples of talcs with regard to specific gravity changes, shrinkage, linear thermal expansion, weight loss behaviour and other structural changes have been determined.

On the Crystal Structure of Talc and Pyrophyllite

On the Crystal Structure of Talc and Pyrophyllite

Talc and soapstone

A literature review is presented concerning the application of thermoanalytical methods, such as differential thermal analysis (DTA), thermogravimetry (TG) and derivative TG (DTG) as well as isothermal measurements for the examination of the thermal decomposition of talc. The crystal structure of this mineral is characterized and relations between the talc structure and its physico-chemical properties and thermal stability are given. The usefulness of isothermal and dynamic thermal methods in studies of the mechanism of talc decomposition to cristobalite and magnesium metasilicate, as well as in talc dehydration kinetics is emphasized. Moreover, attention is paid to the interpretation of the shape of endothermic DTA peaks due to dehydroxylation of the mineral, as well as to the possibilities of detection, identification and quantitative determination of the mineral contaminations frequently encountered in talc, such as carbonates, quartz and chrysotile. In a separate chapter, questions connected with the utilization of thermoanalytical curves for the identification of talc, and its distinction from minerals belonging to other groups than the silicate and aluminosilicate classes are discussed.