Coffee Bonana

Build a proper record of every specimen you own — from catalogue numbers and provenance to hardness, lustre, storage location, and care notes. Search and sort your growing collection at a glance, and keep the details that matter when you are identifying finds in the field or curating a display cabinet at home.

When you need to narrow down an unknown mineral, a built-in Mohs scale reference offers field-tested tips, common examples, and practical test tools. Log streak colour against each entry to capture a key diagnostic clue, and keep a separate wishlist for minerals you want to acquire — with size, budget, and source notes ready for your next show or trade.

Everything runs entirely on your device. No accounts, no ads, and no cloud sync — your collection data stays private and available whenever you need it, whether you are a weekend rockhound or a serious collector building a lifelong catalogue.