Explore 120 minerals with photos and teaching illustrations. Learn Mohs hardness, chemical formula, crystal system, luster, streak, where each mineral forms and how it is used. Use the Mohs scale, compare two minerals, take name or hardness-duel quizzes, collect cards and review missed answers. Content is available in Korean, English, Japanese and Spanish. Records stay on your device and can be backed up as JSON files. Atlas content works offline; ads require an internet connection. Photo credits and licenses are included. Some minerals contain lead, mercury, arsenic or radioactive elements: never put them in your mouth or breathe their dust, and collect with an adult. Educational content.
Contains ads. Photo credits and licenses are available in each mineral detail.
Explore 120 minerals with photos, Mohs hardness, comparisons and quizzes