Rare Geometric Triangular Amethyst Geode Wings White Agate BandingRare Triangular Butterfly Formation Deep Purple Amethyst Druzy on White Agate Frame Amethyst geodes can form in many shapes, but this rare matched pair has something you almost never see: a clean, naturally triangular crystal pocket. Geode cavities usually form as rounded or oval pockets, so a sharply defined triangle, especially in a mirrored pair, is truly rare. Paired with rich purple amethyst druzy, a sharp white agate frame, and the natural green