Although the book is focused on present-day mineral collectors and their collections, the first chapter is an abbreviated history of mineralogy and mineral collecting in Brazil. He notes not just minerals but also fossils, lithic objects, meteorites, and gemstones are included in the book. Cornejo's comments can be summed up by his statement (p. 6) that the book is "A paper museum showcasing the foremost pieces of Brazilian mineral collections.". [Extracted from the article]