Rare "Super 7" Cacoxenite Amethyst Slice Pendant

"Super 7" Cacoxenite Amethyst slice polished pendant ( 1 5/8" X 5/8" ) with sterling silver bail. Brazil origin gemstone with chevron pattern within. 2 1/8" L overall. 6.2 grams weight, gemstone & silver. Cacoxenite Amethyst is known as "Super Seven" or "Melody's Stone". Semi precious gemstone material well known as Cacoxenite or Cacoxenite Amethyst. Cacoxenite is a mineral that is an inclusion within quartz.