The present work shows a study to incorporate volcanic tuffs as raw material in the preparation of industrial glass that traditionally uses feldspar. The X- ray diffraction patterns obtained with hot camera depict an unstable mineralogical phase under special conditions of atmospheric pressure in which appears the quartz polymorphic transformation. Thermal analysis curves present a shoulder at 680oC and an endothermic peak around 840oC corresponding to reactions of formation of silicates. It suffers an overlapping effect toward smaller temperatures favouring glass formation.
Key words: Glass, volcanic tuff, endothermic peaks.
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