blue chalcedony
bracelet of blue chalcedony & rainbow moonstone
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| composition | silicon dioxide |
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| name source | from the ancient Bithynian maritime city of Chalcedon (now Kadikoy), on the Sea of Marmara in modern Turkey |
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| other accepted names | agate, chalcedononyx, chalcedonite |
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| historical aliases | leucachate |
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| color | semi-transparent blues, gold to brownish yellow, aqua, and more |
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| color source | mineral impurities, dye, heat treatment |
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| significant sources | Namibia, Turkey and US (Oregon) |
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| MOH scale | 7 |
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| care and treatment | Clean in an ultrasonic jewelry cleaner or with warm, soapy water and a soft brush. |
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