Found in India and South America.  Onyx is also called Sardonyx when it has ribbon bands in it.  The colors
range from light and dark bands, which can have colors in brown, red, black, white and grey.

Known as the separate stone.  It assists in releasing the person from negative emotions, including sorrow
and grief.  A great stone to use to assist in reducing stress and balancing emotions. Assisting the individual
to separate through ending unpleasant or unhappy relationships. Also, to let go of past relationships that
the individual still has not gotten over yet.

It absorbs and transmutes negative energy.  Also, an excellent stone for protection and grounding.  
Associated with the base chakra.  It encourages the connection from the goals that we have here on earth.  

Black Onyx assists one in relieving fears and worries.  Making the user feel more comfortable about
themselves and their environment.  

Assists in:

Self confidence
Responsibility
A healthy ego
Stress
Apathy
Intuition
Changing bad habits
Vigor
Strength
Stamina
Constancy
Steadfastness
Courage
Self control
Reduces sexual desires

On the physical level it can assist with the following:

Heart
Kidney
Nerve
Capillary
Hair
Eye
Nails
Neurological disorders

Chakras associated with:

Base

Astrological signs associated with:

Leo
Onyx