Why the Hardest Rocks Can Be Easy to Break

From SciShow.

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-content/uploads/2016/06/96.pdf
Topaz | Geoscience Australia
Cleavage of Minerals | Geology In
https://www.tandfonline.com/doi/abs/10.5408/1089-9995-55.1.56
The Largest Faceted Gemstones in the World | Geology In
Moh’s hardness scale compared to indentation hardness
https://www.chemeurope.com/en/encyclopedia/Indentation_hardness.html
http://www.minsocam.org/ammin/AM21/AM21_75.pdf
https://www.palagems.com/topaz-buying-guide
https://www.langantiques.com/university/beryl-2/
https://www.gemsociety.org/article/topaz-jewelry-and-gemstone-information/
https://www.ga.gov.au/education/minerals-energy/australian-mineral-facts/sapphire

Image Sources:
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