A free app for Android, by Andrei Ionut Apopei.

If you want to learn more about the various aspects of geology, there is no better application than the Geology Toolkit. This app is a guide that can be used for both educational purposes and practical work. It is aimed at geoscientists, so it provides answers to the most commonly asked questions in this field. 

The app is very easy to use, so even if you have no previous knowledge of geology, you will be able to use it. It is developed for both educational and professional purposes, so it can be used in a classroom or in a laboratory. With this app, you will be able to explore many different types of rocks and minerals, as well as fossils.

You will be able to recognize the characteristics of each rock and even learn more about its composition. You can also use it to determine the temperature and the pressure of the rock.