Know what you found,
and how sure that is.
Take a photo of a rock, mineral or crystal. Rock Identifier names the closest match from a reviewed reference library, tells you how confident it is, and gives you three quick home tests to confirm it.
Built for the trail and the kitchen table.
An answer you can check yourself, not just a confident guess.
From One Photo or Three
Matches your rock against a reviewed library of common rocks, minerals, crystals and man-made look-alikes like slag, concrete and sea glass.
An Honest Answer
Every result says how sure it is and shows the closest alternatives. With several photos, agreement raises confidence and disagreement is shown, not hidden.
Settle It at Home
Streak on the back of a tile, scratch with a nail or glass, try a fridge magnet. Record what you saw and the app shows which candidates fit and which are ruled out.
Reference Facts, Not Guesses
Hardness, streak, luster and magnetism come from the built-in library, with cautions where they matter, such as lead in galena.
Log Your Finds
Save each find with its photo, the result, your notes and the tests you ran. Your collection stays on your phone.
No Sign-Up
No account and no login. Open the app and identify.
Start free.
Upgrade if it earns it.
Get one identification a day free, with the full result, the home tests and an unlimited collection. Go Pro for unlimited identifications, up to three photos per rock and collection export.
WHAT YOU GET WITH PRO
- Unlimited identifications
- Up to three photos per rock for a more consistent answer
- Export your collection
- Results, tests and your collection stay free either way
Cancel any time · No account required
Free to download.
Identify your first rock in seconds. No account needed.
Support
Email SupportEmail support+rockid@fosterapps.com and include:
- A short description of what you were doing.
- Steps to reproduce the issue, if you know them.
- What you expected vs. what actually happened.
- Your device model and Android version.
- Any screenshots that might help.
Privacy policy
Read the full policy at the Rock Identifier: Crystal Scan privacy page.