Limonite Concretion (Ironstone)
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
sedimentary
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
Live from the field
Recent identifications
A rolling collection of rocks, minerals, and gems just identified by the Rock Identifier community.
Caribbean Calcite
Calcite (CaCO3) with Aragonite (CaCO3)
mineral
Lapis Lazuli
Lapis Lazuli (Complex silicate mixture containing Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Green Tourmaline
Elbaite (part of Tourmaline group), Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Amazonite
K(AlSi3O8) - Potassium Aluminum Silicate
mineral
Red Jasper (River Pebble)
Jasper (Silicon Dioxide, SiO2)
sedimentary
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.
Take Rock Identifier out into the world.
Free to download. The next rock you pick up — name it.