So, rocks are hard. But the scale we use to rank them, the Mohs scale, is only really good at quantifying that for one kind of hardness, and topaz is a perfect stone to talk about to explain that. And you can check it out in our SciShow Rocks Box subscription!

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Sources:
Mohs Hardness Scale (U.S. National Park Service).
https://ballarini.cive.uh.edu/wp-cont...
Topaz | Geoscience Australia
Cleavage of Minerals | Geology In
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The Largest Faceted Gemstones in the World | Geology In
Moh's hardness scale compared to indentation hardness
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http://www.minsocam.org/ammin/AM21/AM...
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https://www.langantiques.com/universi...
https://www.gemsociety.org/article/to...
https://www.ga.gov.au/education/miner...

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