Onyx is formed by the deposition of silica in gas cavities in lava, which results in the distinctive bands or stripes we see in the stone. They come in varied shades of red, orange, and brown, which often alternate with striking bands of white. The banding in onyx is straight, and is either brown or black and white, while curved bands occur in the variety of quartz known as agate. Onyx can be found in Uruguay and bordering regions of Brazil, Afghanistan, India, Madagascar, Peru and the US. Baja California, and northwest Mexico .
Onyx - is a good stone to have around during times of mental or physical stress or bereavement, as it provides strength and support during difficult circumstances. Black Onyx is a soothing stone said to help alleviate fears and worries and to help you to feel comfortable within yourself and in your surroundings. It is also believed to promote stamina and vigor and to encourage the making of wise decisions. Black Onyx is said to promote self-control helping the wearer to keep excessive emotions and passions under control.
*The information provided here is for entertainment and reference purposes only. It is based on centuries of folklore, most of which came the birthstones of your loved ones.