Large purple amethyst cake sparks wedding cake trend. Three different angles of Rachel Teufel's amethyst geode cake to show the depth of the design. Ali N Garrett Photography/Intricate Icings Cake ...

Geode is a type of sedimentary and volcanic rock that is hollow, vaguely circular rock, in which masses of mineral matter (which may include crystals) are sequestered. The term 'Geodes' was derived ...