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The study of etch products is highly desirable for economical re-use of etchants and for the better etching efficiency of detectors used in solid state nuclear track detection technique. A variety of inorganic and organic compounds, formed in the reaction of CR-39 detector with sodium hydroxide solution have been studied. Out of different possible compounds, a crystalline etch product was examined through macroscopic, microscopic and XRD studies. This was identified as mineral “Thermonatrite”.