The most commonly used Onyx, is the Black Onyx, but it can be found in other colours and banded; they carry the same basic properties/correspondences with a few additions here and there. Some colours may have been naturally heat treated, or "helped" by man.
Zodiac signs: Libra, Leo
Chakras: Root, Solar Plexus, Brow
Whether heated treated or natural, Onyx is considered as a greatly protective crystal with a certain amount of grounding, although not as much as Black Onyx. It helps to restore your faith in people who may have given you cause to mistrust them; it encourages perseverance and will power especially when doing something that may be boring or challenging, bringing help with paying attention to detail, focusing. It is also considered as helping with self-control, self-confidence and self-power, bringing inner strength with a calming influence. This calming influence also extends to nervousness, anxiety and hot tempers; brings reasoning into passionate situations!!!!