Best known as a deep black stone, onyx also comes in colors like white, brown, green, pink and yellow. The stone often features stripes, which can be thin or thick, in red, brown, black, white or gold. Yellow onyx is often used as a construction material, but the ancient Roman and Aztec healers believed the stone had powerful properties. Astrologers believe stones like onyx have the power to affect the human body through a series of vibrations that radiate the body's seven chakras, or energy centers.
A member of the quartz family, onyx -- including yellow onyx -- has a hardness of 7 on the Mohs scale. The scale rates gemstones from 1 to 10, with 10 being the hardest.
Being a member of the quartz family, onyx is believed to have healing properties. Yellow onyx is said to help with healing wounds, regulating organ function and strengthening the back. Healers also use the stone to address ailments in the eyes and ears.
Solar Plexus Chakra
Yellow onyx is said to open the solar plexus chakra, or the third energy center. This chakra is associated with physical strength and emotional stability. You can place yellow onyx or other yellow stones on your solar plexus to open and gain control of your solar plexus chakra; once you attain this control, you can gain a sense of peace.
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Yellow onyx is associated with seriousness and logic, and is said to help one who wears it know when to keep silent in certain situations. Physically, onyx can help sooth anxiety and depression and can boost emotional strength.
Kristen Osborne has been writing and editing professionally since 2001. She has worked for a handful of newspapers and magazines, covering myriad topics, from sports to health care. Osborne possesses a bachelor's degree in communications as well as master's degrees in English and creative writing. She currently is pursuing her Ph.D. in English.