Why is it so difficult to work on geochemical composition? Supervised geochemical composition data processing to study colouring iron oxide rich rocks in archaeological contexts - data set

Matrix compilation dataset use for statistical analysis on geochemical compositional data on Pigmentothèque project references (Connaux, Huy, Bordezac, Roussillon, Thoste, Pierremorte, Pierrerue) and Grotte aux Points artefacts. Sheet 1 : compositional raw data in ppm with associated error (fit error = calculation error)Sheet 2 : compositional data normalised by iron composition, formula in the cellSheet 3 : Sheet 2 clean Sheet 4 : log 10 normalised data set from sheet 3, formula in the cellSheet 5 : Sheet 4 clean