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Fire agates have beautiful iridescent rainbow colors, similar to opal. They have a hardness of 6.5-7 on the Mohs scale, [1] which reduces the occurrence of scratching when polished gemstones are set in jewelry. The vibrant iridescent rainbow colors found within fire agates are created by the Schiller effect, which is also found in mother-of-pearl.
Agate is also still used today for decorative displays, cabochons, beads, carvings and Intarsia art as well as face-polished and tumble-polished specimens of varying size and origin. Idar-Oberstein was one of the centers which made use of agate on an industrial scale. Where in the beginning locally found agates were used to make all types of ...
Agate. Agate is a fibrous, banded variety of chalcedony that occurs in a variety of colors and patterns. [9] Iris agate shows exceptional iridescence when light (especially pinpointed light) is shone through the stone. Landscape agate is chalcedony with a number of different mineral impurities making the stone resemble landscapes. [10]
Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 v
Labradorite ((Ca, Na)(Al, Si) 4 O 8) is a calcium-enriched feldspar mineral first identified in Labrador, Canada, which can display an iridescent effect ().. Labradorite is an intermediate to calcic member of the plagioclase series.
Artisans used agate as the base stone, and then embellished the beads lines and shapes using ancient methods that remain mysterious. Treatments may have included darkening with plant sugars and heat, bleaching and white line etching with natron , and protecting certain areas with grease, clay, wax or a similar substance.
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Agate is a variety of chalcedony that is fibrous and distinctly banded with either concentric or horizontal bands. [34] While most agates are translucent, onyx is a variety of agate that is more opaque, featuring monochromatic bands that are typically black and white. [35] Carnelian or sard is a red-orange, translucent variety of chalcedony.
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