MohsVault

MohsVault is an offline field companion for rockhounds, students, and curious collectors. Browse a built-in catalog of 200+ minerals, identify your finds with a guided test, and build a personal collection — all on your device, with no account and no internet required. Stone of the day Open the App to a fresh featured mineral each day, with its color, Mohs hardness, and estimated value at a glance. Your collection stats and upcoming trips sit right below. Library Everything in one place across four tabs: a searchable, filterable mineral catalog; your active collection of finds grouped by category; archived trips; and a trip planner. Filter by color and rarity to narrow the catalog down fast. Guided identifier Not sure what you picked up? Answer two field-testable questions — approximate Mohs hardness (with real scratch-test references) and dominant color — and get a ranked list of likely matches with a confidence score. Mineral detail Each stone opens to an immersive page keyed to its color, with a visual Mohs hardness scale, key properties, and a step-by-step identification timeline. Trips Plan collecting trips on a calendar, attach minerals, and get a local reminder before each outing. Yours, and private Add your own custom minerals, jot notes, and estimate value. Everything is stored locally on your device — nothing is uploaded, and you can erase it all anytime. Key capabilities - 200+ mineral reference catalog, searchable and filterable by color and rarity - Guided identifier using Mohs hardness and color, with scratch-test references - Personal collection of finds grouped by category, with value estimates - Trip planner with a calendar and local reminders - Add custom minerals with properties, identification steps, and notes - Daily "stone of the day" and at-a-glance collection stats - Fully offline — no account, no sign-in, no tracking - Light and dark themes; haptic feedback Who it's for Rockhounds and amateur geologists, mineral and crystal collectors, earth-science students, and anyone who wants to identify and catalog stones in the field without a signal. Privacy MohsVault works entirely offline. It does not require an account and does not collect, transmit, or sell your data. Your minerals, collection, and trips stay on your device. Support For help or feedback, use the support contact provided in the App Store listing.