The paper presented is the result of the author's doctoral research, which included an excerpt on the formation of the mineralogy collection of the former Escola de Minas de Ouro Preto, currently the Escola de Minas da Universidade Federal de Ouro Preto. This analysis aims to map the trajectory of the collection from its entry to the museumization of the samples. As a methodological path, the exploratory research collected information in online repositories and in the archives of the Escola de Minas da UFOP and the Museu de Ciência e Técnica da Escola de Minas da UFOP. This study sought to answer how the set of minerals present in the Mineralogy Office contributed to the training of mining engineers in the 19th and early 20th centuries. The results show a movement of collections from other national and foreign institutions and their didactic use even after their museumization in 1930 1. Introdução .