What's the difference between black agate and onyx?

A semiprecious variety of chalcedony quartz that is a used often in jewelry. When chalcedony is variegated with spots or figures, or arranged in differently colored layers, it is called agate; and if by reason of the thickness, color, and arrangement of the layers it is suitable for being carved into cameos, it is called onyx.  From a mineral or chemical standpoint they are almost identical, and from a fashion jewelry standpoint they are both great stones for pendants, rings, bracelets, and earrings.  

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http://www.instylesilverjewelry.com/Black-Agate-Cocktail-Hour-Silver-Bracelet-p/b0211.htm


http://www.instylesilverjewelry.com/White-Onyx-Cocktail-Hour-Silver-Dangle-Necklace-p/n0488.htm

 



















Check out the site below to see more on gemstones.
mineral site to look up stones.
http://www.mindat.org/min-2999.html

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