M. Cross on Instagram: "I recently had the pleasure of working on a mineral photo/video project that’s easily one of the highlights of my mineral career: a group of fine mineral specimens headed to the upcoming Christie’s auction. This Medina aquamarine was one of the standouts for me. It’s exciting to see minerals showcased at this level, alongside major works of art at one of the world’s leading auction houses. A few words from Christie’s about the auction: “This sale brings together rare luna