Abstract
The utility of polarization microscopy in different branches of glass and ceramic has been discussed. Beside identification of different constituents, and evaluation of the raw materials, petrographic studies may help in explaining anomalous observations and in correlating properties. The role of impurities has been discussed quoting a few examples. In the study of stones in glass, petrography is extended from identification to locating the source of the defect. It may ensure a control over quality during production as also over the degree of firing of some ceramic materials.
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