Tanzine Aura Quartz: is bonded with gold and indium and sometimes Niobium to form a indigo, bluish purple color.
According to Judy Halls book The Encyclopedia of Crystals it is also wonderful for regulating the pituitary, pineal and hypothalamus gland. It creates helps to create balance in hormones and metabolism.
The indigo color resonates with the third eye chakra and helps to enhance your intuition and psychic abilities. Encouraging you to communicate with your guides, Angels and in my opinion Unicorns🦄
My photo & it has been slightly edited to enhance the beauty of the crystals