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Blue Chalcedony specimen

Blue Chalcedony

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Pale blue to blue-grey, translucent, waxy luster. The blue colour is not from a chromophore but from the Tyndall effect (light scattering by colloid-sized particles) — transmitted light looks yellowish or reddish rather than blue.

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Photos are visual references for the named crystal or material. They are not a laboratory authentication of the photographed specimen.

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