Azurite: Dense merged crystals of Azurite are found in copper-ore areas of USA, in Russia (Altai and Ural), Kazakhstan, Germany, Zaire (Africa) and Australia. Separate large crystals of this mineral are found more rarely. From the point of chemistry azurite is a copper carbonate. Its blue color is explained by iron compounds.
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