Petrologic is an Android application that offers a comprehensive guide to rocks. It provides a short description of 36 igneous, 29 sedimentary, and 24 metamorphic rocks.

Whether you're a geology enthusiast or a student, Petrologic is an excellent resource to learn about rocks. With its user-friendly interface and detailed information, it is easy to navigate and understand. The app is compatible with Android 2.2 and is completely free.

Overall, Petrologic is a valuable educational tool that provides a wealth of information about rocks. It is an ideal app for anyone interested in geology or looking to expand their knowledge about rocks.