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Agate (/ ˈ æ ɡ 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.
The Brazilian teal was formally described in 1789 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae.He placed it with all the other ducks, swans and geese in the genus Anas and coined the binomial name Anas brasiliensis.
Some are carnelians or black agate with thin white etching patterns resembling the back of a turtle, which is an ancient pattern that dates back to the era of the Harappan Indus culture. Ancient Roman agate beads as well as etched Bactrian, Middle Eastern, Chinese, Afghan, Yemeni, [6] and Indian agate and carnelian beads made their way into ...
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Carnelian (also spelled cornelian) [3] is a brownish-red mineral commonly used as a semiprecious stone.Similar to carnelian is sard, which is generally harder and darker; the difference is not rigidly defined, and the two names are often used interchangeably.
Etched carnelian beads have been found from female Saka burials dated 8th-6th century BCE in Pamir, Tajikistan, all likely imported from Ancient Pakistan. [47] Etched carnelian beads, probably manufactured in Iran or Central Asia where found in the tomb of Saka tomb of Arzhan-2, suggesting trade exchanges with the south. [48]