Two Fire Agates, Mexico

With colors more vibrant than opal, fire agate does not run the same risks of fading, cracking or scratching. Not a well known gem, fire agate, a variety of chalcedony, is though to form by volcanic activity when hot water saturated with colloidal silica and iron oxide invades cavities in the host rock below the earth’s surface. During the cooling process chalcedony with iron oxide begins to grow on any available surface with many shapes and colors being formed by the mineral impurities. Known as schiller, the alternating silica and iron oxide layers, diffract and allow light to pass and form interference of colors known as “fire”. The iron oxide is what gives this gem its characteristic brown body color. Polishing fire agate is done in such a way as to follow the natural contours of the stone until only the fire is visible. The present two stones, both of oval outline, are contour polished to reveal their vibrant colors in hues of red, orange, yellow and green. The pair would make an excellent choice for cre

Date de cette photo : 1 mai 2008 - 19:37
Envoyé par : Alain Truong

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Gemmes & Gemmologie : 149 photos