Onyx is a Chalcedony that occurs in bands of different colors.
LEGEND: Black Onyx is a protected stone connected to the fire element. Black Onyx used to banish grief and increase self control.
Opal is a mineral of hydrated silica, noted for its rich iridescence. Opal is inferior to quartz in hardness and specific gravity. The precious Opal presents a peculiar play of colors of delicate tints and is highly esteemed as a gem. Opal is the birthstone for October.