Once you find basalt, you've found the geode and the amethyst crystals inside are yours for the taking. Finding amethyst geodes in Minecraft, though, is no easy feat, as they're only about 20 ...

Amethyst is a violet variety of quartz that has been used as a gemstone for many centuries and is a key economic resource in northern Uruguay. Geodes are hollow rock formations often with quartz ...

15 December 2014. Amethyst geode brings purple hue to geology gallery. A 660 kg, one-metre high geode containing amethyst crystals and sourced from solidified volcanic ash in Minas Gerais state of ...