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Black onyx a variety of chalcedony-agate, a mineral from the quartz group.
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Onyx is a variety of agate, which instead of folded stripes has black and white stripes, parallel, straight, also in a solid color without stripes.
A characteristic feature of agate is its variety of colors, often very vivid. Irregular and wavy color bands can be white, blue, red, gray, black or brown. Those are the result of the admixture of iron and manganese.
Agates form in voids and crevices, mainly volcanic rocks, where they fill the spaces created by the gas that has evaporated during the solidification of the liquid rock. They form microscopic fibers and crystals, unlike quartz.
Because agate is characterized by an exceptionally diverse and beautiful color, it was one of the earliest spotted stones. The ancient Sumerians and Egyptians used it. In all ancient cultures, agate was used, not only in the manufacture of decorative objects and articles of various vessels and vases, but also in the making of all kinds of amulets. The ancient Greeks achieved the highest level of artistic processing of agates. Nowadays, agate is a very popular mineral for making jewelry, cameos and brooch for covering items such as glasses and table tops.
Occurrences: Afghanistan, Brazil, India, Madagascar, Mexico, Peru, United States.
Black onyx in astrology: Western astrology links black onyx with the zodiac sign of Leo, Capricorn and with the month of: February, August.
Data sheet
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