Check the listing for details. natural amethyst crystal cathedral geode. Condition: Used. Listed at 24.00 USD. The product is a natural amethyst crystal cathedral geode, which is a beautiful and unique collectors' item. This geode features stunning amethyst crystals that have formed in a cathedral-like structure, giving it a striking and intricate appearance. It is a popular choice among rock, fossil, and mineral enthusiasts for its beauty and rarity. 2” x 3 1/4” x 2 3/4”