Discover thousands of rock and stones types with the Rock Identifier App If you are looking for a free app that enables you to identify rocks and stones simply by photographing them with your mobile phone, you should definitely try Rock identifier. It’s that simple! You take a photo with your phone or upload an existing image from your gallery and quickly find out the name of that particular rock, gem, crystal, or stone. This app allows you to identify gemstones, flagstone, rocks, and minerals