universe___education on Instagram: "- The post showcases a video of miners extracting a large, flawless pyrite cube from Navajún, Spain, a unique site yielding cubic crystals up to 5 cm per side due to slow crystallization in Late Jurassic sediments 120 million years ago. - Pyrite's perfect cubic shape stems from its isometric crystal lattice, where iron-sulfur bonds align at 90-degree angles, as detailed in mineralogical analyses from the European Journal of Mineralogy. - Navajún specimens, pri