A brown to brownish-red translucent variety of Chalcedony. Pliny the Elder stated that it was named after Sardis, in Lydia, where it was first discovered; but the name probably came with the stone from Persia (Pers. sered, yellowish-red).
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(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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