Geology Toolkit Premium is an Android app designed for geologists, hobbyists, and students who want to explore and examine minerals, rocks, and fossils. Created by Andrei Ionut Apopei, a geologist, the app offers a practical, comprehensive, and user-friendly interface for identifying various minerals and rocks. It is useful for laboratory work, field trips, and individual study. One of the great things about Geology Toolkit Premium is that you can use it offline.

The app features over 117 common minerals in thin section, 87 igneous, metamorphic, and sedimentary rocks, and more than 500 entries of fossils. It also includes a Handbook of Mineralogy, Handbook of Rocks, and a searchable Mohs Hardness Scale for over 80 common mineral species. The GeoQuizzes feature allows you to test your knowledge of the material on the app or from your class/laboratory/field. Geology Toolkit Premium is a one-time purchase that offers monthly updates.