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Onyx Science

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Onyx is formed by the deposition of silica in gas cavities in lava, which results in the distinctive bands or stripes we see in the stone. They come in varied shades of red, orange, and brown, which often alternate with striking bands of white. The banding in onyx is straight, and is either brown or black and white, while curved bands occur in the variety of quartz known as agate. Since ancient Egyptian times, onyx has been stained to improve or change its color. Natural black onyx is rare, so the commercial black variety is usually agate that has been stained by the sugar-sulfuric acid treatment, soaked in sugar and then heated in sulfuric acid to carbonize the sugar. It may be banded or solid black.
onyx-where-found-history-gemstones.jpg Onyx can be found in Uruguay and bordering regions of Brazil, Afghanistan, India, Madagascar, Peru and the US. Baja California, and northwest Mexico were a major source for onyx until cheap imitations appeared on the market.
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The best way to clean an onyx is to wipe it clean with a moist cloth. It is not recommended to use any sort of ultrasonic cleaners or ammonia as the stones may be porous and therefore might absorb chemicals, even soap, which can build up inside the stone, causing discoloration.
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December learn about Black Onyx
Did you know that wearing black onyx jewelry is said to protect you from harm? Did you know that soldiers of ancient times used to carry onyx with them to guard against injury? Learn all there is to know about black onyx and black onyx jewelry in our informative collection of facts and legends about onyx, the blackest of gems.
Create a Keepsake
Combine Black Onyx with any gemstone to create your own unique family keepsake with the birthstones of your loved ones, or your favorite combination of colors.
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