Turquoise - Sterling Silver Chemical Formula: {Ca2}{Mg5}(Si8O22)(OH)2

Chemical Formula: {Ca2}{Mg5}(Si8O22)(OH)2

Display Size: 8

To have an agate specimen similar to this in your collection is something special to say the least

roughly 20

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Turquoise - Sterling Silver Chemical Formula: {Ca2}{Mg5}(Si8O22)(OH)2This ring features a beautiful two toned turquoise stone with a "snakeskin pinstripe" design on the shank. Size: 8 Stone Size: 10 x 12 mm Turquoise is a hydrated mineral that contains both copper and aluminum. It is the inclusion of these metals that causes the blue green color. Turquoise has had many names over the years including the Greek word "callais" and the Aztec word "chalchihuitl." However, its current name comes from the french word