Onyx
 
Gives strength, Imparts self-confidence, helping you to be at ease in your surroundings. Onyx banishes grief, enhances self-control and stimulates the power of wise decision-making. It encourages happiness and good fortune. Black onyx can give us the strength to look within ourselves, to understand the past, present, and future, and to take charge of our lives going forward. Onyx treats disorders of the bones, bone marrow and blood. It is beneficial for teeth and the feet. Associated with the Earth element, by activating your root, solar plexus, and third eye chakras, one is able to fully ground themselves to Earth. 
Black onyx also helps to balance yin and yang. It helps us to feel centered, make wise decisions, and get to the root cause of issues. It can assist with logical thinking, as well as intuitive receptivity. Black onyx can be used in crystal grids to absorb negative energy and offer protection.
 
Zodiac
Gemini 
Leo