Results of statistical investigations of all available chemical data on flint and chert are leading to the following nomenclatoric proposal to differentiate between flint (synonym: Feuerstein) and chert (synonym; Hornstein) as the two most frequent representatives of siliceous concretions. This proposal is subsequently based on todays linguistic usage. But it is statistically significant, easy and customary in petrology and may therefore terminate the perpetuating discussion still necessary for every author of papers on flint and chert.