How to Test the Hardness of a Mineral (Old Scout Field Guide)

I demonstrate testing the hardness of various minerals. I also demonstrate which minerals scratch (or can be scratched by) household materials.
For more information: geology.com/minerals/mohs-har...
Mohs Hardness Scale:
1 - Talc
2 - Gypsum
3 - Calcite
4 - Fluorite
5 - Apatite
6 - Feldspar
7 - Quartz
8 - Berryl/Topaz
9 - Curundum
10 - Diamond (not pictured)

[@westonbeard3690]

Short and sweet video. Thank you.

[@thegreentiger4930]

I have some stones that can't be scratched by corundum even by diamond. I have no idea what stones they are. They do not seem like diamond at all. I have just uploaded the testing video.

[@nickgorman9713]

I have courts