Onyx is a variety of agate, which is a variety of chalcedony, which is a variety of quartz. Onyx is encountered in white, black and beige-brown. Its name is of Greek origin and refers to the lines that can be seen on the claws of several animals. It is considered to give courage to overcome difficulties and encourage decision-making. This mineral is also mentioned in Theophrastus’ work. In the bible, it represents Benjamin, the twelfth tribe of Israel.
Tiger’s eye is one of the most popular quartz varieties. It has a brown color with golden-yellow veins and displays an excellent luster. These veins retain the fibrous structure of crocidolite. It exhibits a characteristic linear iridescence like a moving reflection. This very characteristic optical effect is known by the French word chatoyancy, which means “cat’s eye” and symbolizes the union of the Earth with the Sun. Tiger’s eye is considered to promote decision-making and self-confidence. It is encountered in the USA, South Africa, Namibia, and Brazil.