I had a look on kaggle but I did not find what I was looking for. I need a very simple data set, like the one of "iris" default pre-sets of R where you have differents columns with some characteristic of the plant such as length and so on and where the last column tells you the type of species. There is an analogous dataset, for example about rocks, where may be some columns tells a characteristic such as permeablity and so on, and the last column tells you the type of the rock. I need to practice an easy data analysis to be performed with R (for an exam). I could not find somethin like iris neither on the R dataset.