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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 (/ ˈ æ É¡ ɪ t / AG-it) is a fibrous, banded variety of chalcedony. [1] Agate stones are characterized by alternating bands of different colored chalcedony and sometimes include macroscopic quartz. They are common in nature and can be found globally in a large number of different varieties.
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 hide
In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
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. [33] While most agates are translucent, onyx is a variety of agate that is more opaque, featuring monochromatic bands that are typically black and white. [34] Carnelian or sard is a red-orange, translucent variety of chalcedony.
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