AI-powered field geology

Identify any rockfrom a photo.

Snap a photo of any rock, mineral, gem, or crystal — Rock Identifier names it in seconds and explains how it formed, what it’s made of, and where it came from.

4.7on the App Store

Rock Identifier app showing an identified specimen

Live from the field

Recent identifications

A rolling collection of rocks, minerals, and gems just identified by the Rock Identifier community.

Browse all

Coarse granite (likely weathered biotite granite)

Granite; quartz + feldspar + biotite/hornblende, approximate composition 20–60% quartz and abundant K-feldspar/plagioclase

igneous

Banded agate tower (likely onyx/chalcedony)

Microcrystalline quartz, SiO₂; commonly called banded agate or black-and-white onyx

mineral

Polished amethyst

Quartz, SiO₂; purple variety colored mainly by iron-related defects and irradiation

mineral

Tumbled quartz crystal

Quartz (silicon dioxide, SiO₂)

mineral

Weathered iron-rich rock, possibly limonite/goethite-bearing breccia

Hydrated iron oxides/hydroxides, mainly limonite (mixture) and goethite, FeO(OH)·nH₂O

mineral

Tumbled gray agate/chalcedony (probable)

Microcrystalline quartz, SiO₂; likely banded chalcedony or agate

mineral

Fossiliferous limestone

Bioclastic carbonate rock; predominantly calcite (CaCO₃), with fossil shell fragments

sedimentary

Fossilized bivalve shell

Molluscan bivalve fossil; shell originally composed of calcium carbonate (aragonite/calcite, CaCO₃)

fossil

Milky quartz

Quartz (silicon dioxide, SiO₂)

mineral

Iron-rich basaltic pebble

Basalt, likely weathered and possibly ferruginous

igneous

Purple chalcedony or lavender quartz

Cryptocrystalline quartz, SiO₂ (likely chalcedony; identification uncertain from photograph)

mineral

Galena-bearing sulfide ore

Galena (lead sulfide, PbS), possibly with sphalerite and/or pyrite

mineral

What you get

A pocket geologist, always with you

Identify a rock, then explore everything about it — properties, formation, and your own notes — all in one app.

Photo identification

Point your camera at any rock and get an answer in seconds — no field guide, no guesswork.

Properties & classification

Common name, scientific name, physical properties, and category — the data a geologist would write in a field notebook.

Formation & history

Trace each specimen back through time: how it formed, when, and which geological forces shaped it.

Field notes

Add your own notes to any identification — conditions, observations, or anything you want to remember.

Personal collection

Build a private cabinet of every rock you’ve identified, with your own notes attached.

Community gallery

Browse rocks identified by other rockhounds — and share your own discoveries publicly or keep them private.

How it works

From photo to rock identification in seconds

Step 01
Take a photo
Capture the specimen in natural light. A clear shot of texture and color is all the AI needs.
Step 02
AI does the geology
Our model reads mineral, texture, and color signatures to identify what you’re looking at.
Step 03
Read the report
Get name, classification, formation, uses, and field notes — written like a real field guide.