Mohs scale with 12 minerals
The Mohs Scale is a very useful interdisciplinary tool for analyzing the durability of minerals. As it includes 12 minerals with different durations, it is possible to carry out several interesting experiments including different materials. Although the original scale, created by Friedrich Mohs, includes 10 minerals, in this article you can also find Porcelain, Nail and Glass that, when replacing the Diamond (last mineral on the scale), end up expanding the number of possible experiments.
See other articles in the section Rochas.