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chalcedony - am I blue?

blue chalcedony

bracelet of blue chalcedony & rainbow moonstone

compositionsilicon dioxide
name sourcefrom the ancient Bithynian maritime city of Chalcedon (now Kadikoy), on the Sea of Marmara in modern Turkey
other accepted namesagate, chalcedononyx, chalcedonite
historical aliasesleucachate
color semi-transparent blues, gold to brownish yellow, aqua, and more
color sourcemineral impurities, dye, heat treatment
significant sourcesNamibia, Turkey and US (Oregon)
MOH scale7
care and treatmentClean in an ultrasonic jewelry cleaner or with warm, soapy water and a soft brush.