MineralGuide: Gems & Rocks

MineralGuide: Gems & Rocks is a paid, offline-first field reference for mineral collectors, rockhounds, gem learners, and earth science students. Browse 182 common gems, rocks, and minerals with clear photos, formulas, hardness, density, crystal systems, safety notes, and image attribution. Use the guide anywhere. The core atlas works offline, with no account, no ads, no analytics SDK, no cloud identification, and no cloud sync. Key features: - Offline mineral atlas with 182 species. - Browse by crystal system and search by name or formula. - On-device photo identification that suggests candidate minerals for verification. - Manual filters for color, hardness, crystal system, and streak. - Detailed reference pages with properties, safety hints, and source credits. - Specimen records for photos, locality, date, size, source, and notes. - CSV export for your own collection records. - Daily mineral and Home Screen widgets. - Multilingual interface and reference content. Important: photo identification is an assistive reference feature. It does not replace professional gemological testing, trading appraisal, lab analysis, medical advice, or safety guidance. Always verify important decisions with qualified professionals.