Collections can be very diverse.Tastes and hobbies mark what we want to preserve with more care.Minerals are one of those precious stones that, due to their characteristics or particularities -color, size, texture and even their protective power- make them become the preferred stones to exhibit in a showcase as a collection.It is said that there are more than 5,000 minerals on Earth, and only a few experts know their particularities.Do you want to know some of them?In science, more specifically in the chemical area, minerals can be described based on seven chemical properties: crystalline form, hardness (resistance), fracture (the way it breaks), luster (its reflection), color and density.All of them are easily identifiable thanks to a microscope, with which we can see both the outside and the inside of the stones.To differentiate them from conventional stones, it must be clarified that minerals, so that we can refer to them in this way, must be solid, form naturally, contain a chemical composition and a crystalline structure.It's not every day we find a precious stone.The most common, and only a few, may be for sale in specialized stores, but others are difficult to obtain.Here we leave you a list of the best-known precious jewels today, or that you have surely heard of, and the rarest in the world.Because with the passage of time, Mother Earth continues to surprise us."We have given our mineral collection to our grandchildren""Among our pieces, we have a quartz that is very representative"begoña marin