Onyx 
SiO2 - Silicon Dioxide
Onyx is a rich-looking, affordable black stone. Onyx, sard, and sardonyx are all varieties of chalcedony (microcrystaline quartz). Onyx comes in brown, white, grey, and black. Sard is a reddish-brown variety. Sardonyx is a blend of sard and onyx with the red bands of sard and the white bands of onyx. Onyx is very similar to agate. Onyx has straight bands of brown, white or black; agate has curved lines of many colors. It is often mixed with pearls to create elegant jewelry. More on...
Colors: Brown, white, grey, and black.
Lustre:
System:
Care and Treatment
Since ancient times, Onyx has been dyed to improve it's color.
Often treated agate is sold as Black Onyx.
Onyx may chip or scratch rather easily.
Hardness
Onyx, Sard and Sardonyx all have a hardness rating of 7.
Specific Gravity: 2.65 - 2.66
Healing
Objective thinking; spiritual inspiration; control of emotions & passions, help eliminate negative thinking, apathy, stress & neurological disorders; also used as a heart, kidney, nerve, capillary, hair, eye and nail strengthener.
Where Found
Birthstone Months
Star Stone Months
Anniversary Gemstone
Mystical Properties
Lore
Mexican Onyx (white and brown chalcedony) is said to help one sleep.
Sard (reddish brown chalcedony) was regarded as a protection against incantations and sorcery. It was also believed to sharpen the wits of the wearer.
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