Black Agate
December 30th, 2009
The Formation and Color of Agate
Agate is formed from mineral deposits and is considered by most to be a precious stone.
Agate usually occurs in cavities that have formed from volcanoes (especially ancient lavas). Agates are known to have bands that come in many colors and resemble the rings of a tree. Scientists say that agate is created when gas bubbles inside of cooling lava include saline water. These gas bubbles with saline water turn into a gel. Since there is salt in the water, it attacks the surrounding iron in the lava and creates bands. These bands are extremely intricate and beautiful.
It should be noted that no two stones are the same, making each Agate stone unique and more precious. Agate comes in many different colors and usually in its raw state is dull and rough. In order for Agate to show its true beauty it must be polished.
Agates are widely distributed, although the main deposits are in India, Brazil, Madagascar, China, Russia and Australia. According to Greek legend, Agate was found in the river Achates, which is now called the Drillo River, located in Sicily. However, there is evidence that Stone Age men used Agate more than 15,000 years ago. Today, you can easily find sources in the Western United States, Mexico, Germany, Italy, Brazil, China, India, Africa, etc.
The color of agates can vary significantly, depending on the distribution of minerals within each band. Minerals that contribute to the stone color include: iron oxides (red, brown, black, green), manganese (pink, violet, black), chromium (green, yellow, red), titanium (blue), cobalt (red), nickel (green), and copper (red, blue, and green). The shade of color is further modified when these minerals work in combination. The color can occur through an agate band, or it can form as small, dot-like inclusions. Color can also be influenced by temperature, radiation, pressure, and weathering.
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Jay King Turquoise and Black Agate Sterling Silver 24 Ne…
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Agate wrap bracelet Nocturnal Mystique (Thailand) $67.99 Thailand’s Siriporn evokes the night�s mystical glow as selects black agate for this wrap bracelet. Designed to wrap several times around the wrist, the handcrafted bracelet can be fastened at two different lengths with a black agate button. |
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Agate and onyx braided bracelet, ‘Midnight Sea’ (Thailand) $49.99 Inspired by the midnight sea, Siriporn crafts a beautiful bracelet. She strings gemstone beads by hand on leather strands, then braids them to encircle the wrist with color. Featuring onyx, green agate, blue agate and silver findings, the bracelet closes with a black agate button. .925 Sterling silver |
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Agate and onyx wrap bracelet, ‘Midnight Lake’ (Thailand) $47.99 The beauty of a midnight lake finds an expression in gemstone jewelry. By Thailand’s Siriporn, this design wraps three times around the wrist. The bracelet features onyx, green agate, blue agate and silver findings, and closes with a black agate button. .925 Sterling silver |
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Agate and onyx braided bracelet Midnight Sea (Thailand) $49.99 Inspired by the midnight sea, Siriporn crafts a beautiful bracelet. She strings gemstone beads by hand on leather strands, then braids them to encircle the wrist with color. Featuring onyx, green agate, blue agate and silver findings, the bracelet closes with a black agate button. .925 Sterling silver |
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