Interactive quizzes / Science & Nature
Mineral Scratch Lab
Learn what hardness means for minerals and how the Mohs scale orders them, then read invented scratch logs to rank samples by the lab's own toy rules.
The scratch logs, samples and lab rules are invented for practice, and the scale facts come from the USGS reference. This is not a field identification tool or a physical experiment, so do not try to scratch real specimens based on it.
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