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.
Howlite got its name from the geologist Henry How. It is white in color, features gray veins and it has been widely used to imitate other rarer minerals. Due to its porous nature, it can absorb the dye very well. It is considered to protect against negative energy and the “evil eye”.