The article presents a study on the global chemical weathering of surface rocks, using river dissolved loads as a proxy. By combining water analyses of major rock types with their relative outcrop proportions, the study estimates a theoretical average river composition that closely matches measured values. The analysis is based on unpolluted French watersheds and compares results with data from 16 major rock types. The study highlights the minor influence of crystalline rocks on global weathering and the significant contribution of evaporites to dissolved river loads. Carbonate minerals account for 50% of the total load, with bicarbonates mainly derived from atmospheric and soil CO₂. Major cations from silicate weathering are in the proportions: calcium (45%), magnesium (20%), sodium (20%), and potassium (15%). The study also compares results with previous apportionment attempts and finds that the Temperate Stream Model, based on water analyses of different rock types, provides a more accurate estimation of weathering products. The model considers the outcrop proportions of various rock types and their contributions to dissolved loads. The study concludes that the model provides a better understanding of the relative contributions of different rock types and minerals to global weathering processes. The results show that carbonate rocks contribute significantly to the dissolved load, with evaporites contributing up to 17.2% of the dissolved load. The study also discusses the influence of climate on weathering processes and the importance of considering different rock types and their mineral compositions in understanding global weathering patterns. The study highlights the need for further research to refine the model and improve the accuracy of weathering estimates.The article presents a study on the global chemical weathering of surface rocks, using river dissolved loads as a proxy. By combining water analyses of major rock types with their relative outcrop proportions, the study estimates a theoretical average river composition that closely matches measured values. The analysis is based on unpolluted French watersheds and compares results with data from 16 major rock types. The study highlights the minor influence of crystalline rocks on global weathering and the significant contribution of evaporites to dissolved river loads. Carbonate minerals account for 50% of the total load, with bicarbonates mainly derived from atmospheric and soil CO₂. Major cations from silicate weathering are in the proportions: calcium (45%), magnesium (20%), sodium (20%), and potassium (15%). The study also compares results with previous apportionment attempts and finds that the Temperate Stream Model, based on water analyses of different rock types, provides a more accurate estimation of weathering products. The model considers the outcrop proportions of various rock types and their contributions to dissolved loads. The study concludes that the model provides a better understanding of the relative contributions of different rock types and minerals to global weathering processes. The results show that carbonate rocks contribute significantly to the dissolved load, with evaporites contributing up to 17.2% of the dissolved load. The study also discusses the influence of climate on weathering processes and the importance of considering different rock types and their mineral compositions in understanding global weathering patterns. The study highlights the need for further research to refine the model and improve the accuracy of weathering estimates.