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Chalcedony (SW fl. green, LW fl. tan), Calcite (SW fl., phos. pink), Sioux County, Nebraska, across border from Ardmore, South Dakota (shortwave UV)

Chalcedony (SW fl. green, LW fl. tan), Calcite (SW fl., phos. pink)
Sioux County, Nebraska, across border from Ardmore, South Dakota
(shortwave UV)

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