It's all to do with ... this remarkable rock has layers that tell the story of the working lives and hardships of miners in the 1800s. A flawless blue topaz gemstone - the largest of its kind - will ...

Ever wonder how Earth scientists examine rocks? We cut them up and throw them under a microscope ... and then everything ...

This story was originally published by Grist with the headline The weirdest ways scientists are mining for critical minerals, ...