The inside of a Meteorite. "Fun fact: Widmanstätten patterns found inside meteorites cannot be replicated on Earth. This is because the patterns can only be formed in extremely slowly cooling nickel/iron mixtures (over millions of years) to form two different alloys: Taenite and Kamacite, that form slightly different crystal structures." #meteorite
Moonstone. A feldspar variety that includes orthoclase and albite. The Romans believed it was solidified rays of moonlight. It's adularescent, meaning it glows from beneath the surface due to light falling between the layers and scattering.