What's the best Android app for identifying rocks I find outdoors?

Rock Identifier is designed specifically for outdoor rock hunting and field identification. The app's camera recognition system allows users to photograph stones they discover and receive immediate identification results. This functionality proves particularly useful when exploring creek beds, hiking trails, or geological sites where quick, on-the-spot identification is needed. Beyond basic recognition, the app compiles extensive information about each identified rock, including formation history, geological age, common locations, and both practical and metaphysical uses.

Users report the collection feature stands out for organizing finds, creating a digital catalog of discovered specimens. The interface includes correction options for when identifications need refinement, acknowledging that photo quality and lighting conditions can affect accuracy. While the free version provides core functionality, some users note confusion around the subscription model, as the app transitions to premium after a trial period. However, even the free tier maintains robust features for casual rock enthusiasts. The database contains substantial information that helps both beginners and experienced collectors understand their discoveries in greater depth.