One of the highly sought-after examples of the spoke-patterned gem is trapiche amethyst, which is related to third-eye and crown chakra. Trapiches are one of the rarest specimens on the planet because the geological conditions essential to create these gems are relatively uncommon. Since trapiches are formed with a radiating star of inclusions between mineral growth, don't confuse them with star stones. Some form with a hub or core with spokes radiating from the center of the gem, while others form spokes spreading outward from the core. To define a trapiche gem, highly symmetric habits of minerals are required to form the “arms” or “spokes.”
