Crystal & Rock Identifier—
Identify Any Crystal
From a Photo.
Point your camera at any crystal, rock, or mineral. Google Gemini AI identifies it instantly — crystal system, Mohs hardness, chemical composition, and formation history included. Built by Luna, a rock collector who got tired of carrying field guides.
Current Scan
Amethyst Quartz
How the AI Rock Identifier Works
Stone Snap uses Google Gemini AI to identify rocks from photos. Point, snap, and get your rock identity in seconds.
1. Capture
Take a clear photo of any rock, mineral, or crystal. Works best with natural lighting and a close-up showing surface texture and color.
2. Identify
Google Gemini AI analyzes the photo, cross-referencing color, luster, crystal structure, and texture to return chemical formula, Mohs hardness, and classification.
3. Learn
Read detailed geological data: chemical composition, formation history, locations, and industrial uses. Save specimens to your collection with GPS coordinates.
The Complete Rock Identification App
AI Rock Identifier
Point your camera at any rock, mineral, or crystal for instant identification. Returns chemical formula, Mohs hardness, crystal system, and geological classification from a single photo.
Rocky AI Chat
Ask Rocky anything about geology. Your AI guide answers questions about rocks, minerals, geological formations, the Mohs scale, crystal systems, and earth science.
Personal Collection
Save every find to your digital rock collection. Each entry includes identification, photo, GPS coordinates, date, and full geological properties. All data stored on your device.
Learning Hub
Interactive quizzes, flashcards, and structured mineralogy lessons. Earn XP, track progress, and level up your geology knowledge from beginner to expert.
Magnetic Detector
Uses your phone's magnetometer to measure magnetic field strength in microteslas. Helps identify iron-rich minerals like magnetite, hematite, and pyrrhotite in the field.
Kid Mode
Simplified interface for young explorers with kid-friendly language and colorful visuals. No account required, no data collection. Makes geology accessible for all ages.
A Few of the Thousands of Specimens We Identify
Stone Snap vs Other Rock Identifier Tools
Not all rock identification tools are the same. Here's how Stone Snap stacks up against the most common alternatives.
| Feature | Stone Snap | Google Lens | iNaturalist | Field Guide Books |
|---|---|---|---|---|
| AI Model | Google Gemini | Google Vision | Custom CV model | N/A |
| Rock-Specific AI | Yes — geology-trained | No — general purpose | No — biology-focused | N/A |
| Chemical Composition | Yes | No | No | Some books |
| Mohs Hardness | Yes | No | No | Yes |
| Formation History | Yes | No | No | Varies |
| Personal Collection | Yes — with GPS | No | Observations log | No |
| Learning Tools | Quizzes, flashcards, XP | No | No | No |
| Kid Mode | Yes | No | No | No |
| Price | Free (5 IDs) / $4.99/mo | Free | Free | $15–$40 |
Rock Tumbler Kit
Identify your rocks with Stone Snap, then polish them. Luna's recommended starter tumbler kit for turning rough specimens into polished stones.
Frequently Asked Questions
How does Stone Snap identify rocks and minerals?
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Stone Snap uses Google Gemini AI to analyze photos of rocks, minerals, and crystals. When you take a photo, the image is sent to Google's Gemini model which cross-references visual traits like color, luster, crystal structure, and texture against known geological specimens. The AI returns an identification along with chemical composition, Mohs hardness rating, formation history, and common uses.
What rocks, minerals, and crystals can Stone Snap identify?
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Stone Snap can identify common igneous rocks (granite, basalt, obsidian, pumice), sedimentary rocks (limestone, sandstone, shale), metamorphic rocks (marble, slate, quartzite, gneiss), minerals (quartz, feldspar, mica, calcite, pyrite, amethyst, azurite), and crystals. The AI performs best with clear, well-lit photos showing the specimen's surface texture and color.
Is Stone Snap free to use?
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Stone Snap is free to download on Android with 5 free rock identifications. After that, Stone Snap Pro is available for $4.99 per month with a 3-day free trial. Pro unlocks unlimited identifications, full access to Rocky AI Chat, the complete Learning Hub with quizzes and flashcards, and all premium features.
Does Stone Snap work offline?
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Rock identification requires an internet connection because photos are processed by Google Gemini AI on Google's servers. However, your personal rock collection, identification history, quiz scores, and learning progress are all stored locally on your device and accessible offline.
Is Stone Snap safe for kids?
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Yes. Stone Snap includes a dedicated Kid Mode with simplified language, colorful visuals, and a fun interface designed for young explorers. The app does not require account creation, does not collect personally identifiable information from children, and all data is stored locally on the device.
Who created Stone Snap?
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Stone Snap was created by Luna, a lifelong rock collector and geology enthusiast. She built the app because she was tired of lugging field guides on hikes and wanted a tool that could identify any specimen on the spot. Stone Snap uses Google Gemini AI to power its identification engine.
What Users Are Saying
"As an avid hiker, Stone Snap has turned every trail into a learning experience. The accuracy even in low-light conditions is remarkable."
Marcus T.
Hiker & Outdoor Enthusiast
"The geological data goes deep. Chemical breakdowns I'd normally need a lab manual for. I use it regularly during field work for quick reference."
Sarah J.
Geology Student
"Clean UI, zero fluff. My kids are now obsessed with identifying every pebble in our backyard. Kid Mode is a great touch."
David C.
Parent & Nature Enthusiast
Meet Luna
Luna has been collecting rocks since she could walk. Shoe boxes full of quartz, pockets full of gravel her parents didn't appreciate, and a college geology textbook that fell apart from overuse.
She built Stone Snap because the existing options were terrible. Field guides are heavy. Google Lens gives you a Wikipedia link. She wanted something that could look at a rock and actually tell you what it is — the chemistry, the hardness, where it forms, what it's used for. So she plugged into Google's Gemini AI and built the tool herself.
Try Luna's App Free arrow_forward"I just wanted an app that could do what my geology professor did — look at a rock and rattle off everything about it."
— Luna, Creator of Stone Snap
Luna's Collection
847 specimens
The Best Rock Identifier App for Android
Free to download. 5 free identifications. Powered by Google Gemini AI. Built by a collector, for collectors.
DOWNLOAD STONE SNAP FREEContact
Get in Touch
Questions about the app, subscription, or rock identification? Send us an email and we'll get back to you.
support@stonesnapapp.com