Physical Characteristics: A "Spirit" or "Cactus" crystal is a crystal on which additional, smaller crystals of the same mineral have grown. Amethyst belongs to the quartz family, a silicon dioxide. Hardness of 7. The purple color is derived from iron and aluminum in trace amounts, as well as some form of natural or man-made irradiation.
Metaphysical Characteristics: Amethyst is a stone of protection and cleansing. It is a stone of royalty and therefore has been used as a prosperity stone. It is said to have been one of the stones of the breastplate of the High Priest of the Israelite. The "Cactus" formation is a central crystal encrusted by smaller ones. This formation is also known as a "spirit" Amethyst.
Please Note: The pictures show different views of the same piece.