Each question has 4 possible answers. When you tap one of the answers, the default color of the pressed button is changed for a while to green (when it was the right answer) or to red (wrong answer). You have 3 attempts to give right answer. If you give it at the first attempt you will receive 3 points, at the second attempt - 2 points, at the third - 1 point. After 2 wrong answers the hint with chemical formula of the mineral will be shown to help you. Play the "Mineral Quiz" now to test and improve your knowledge of geology!
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