The Free Mineral & Rock Collection Tracker

Between drawers of tumbled stones, cabinet specimens from field trips, and labels that fade before you get around to writing them down, it's easy to lose track of what's actually in your collection. Collectionizer keeps every mineral and rock organized in one searchable inventory — so nothing gets misplaced or forgotten in a box.

Built for how mineral collectors actually organize

Minerals, rocks, gemstones, fossils, and meteorites are all supported as their own type. Every field is customizable, so you can track what actually matters to you: mineral group, chemical formula, crystal system, color, Mohs hardness, locality of origin, condition, purchase price, and current estimated value. Add photos of every specimen from every angle.

Add specimens in seconds — no manual typing

Just search by mineral name and Collectionizer looks it up for you via Mindat, automatically pulling in the chemical formula, crystal system, and mineral group. Pick the right match and it's added to your inventory — or fill out the form yourself if you'd rather.

Find any specimen in seconds

Full-text search and field filtering let you check "do I already have this one?" while you're at a rock shop, a gem show, or browsing a listing online — before you buy a duplicate.

Share your collection or keep it private

Show off your cabinet to other collectors, or keep your inventory completely private. You're in control.

It's not just minerals and rocks

Collectionizer isn't a single-purpose mineral and rock app — it's a fully customizable collection manager. If you also collect comics, coins, watches, or anything else, set up a collection for that too and manage everything from the same account.

Free to get started

Your first collection is free forever — no credit card required. Sign up now and start cataloging your specimens in minutes.