The bull's eye is a tiger's eye that has been heated and its color has changed from yellowish-brown to mahogany-brown. It is a variety of quartz that presents the "chatoyance" effect, vertical bands with reflections reminiscent of a cat's eye. This effect is produced by the orientation of the fibrous inclusions that the mineral contains.
In tiger's eye and bull's eye the fibers of crocidolite (blue asbestos) are altered and transformed into iron oxides, which are later replaced by silica.
Deposits: South Africa, United States, India, Mexico and Australia.
The ox's eye is considered a stone of strength and will. It favors physical resistance and protection from dense energies. The porthole is associated with the 2nd chakra and symbolizes rooting and connection with mother earth. It promotes safety and integrity.