$30.00
M805: South Dakota Chalcedony– Locality: South Dakota. Selection: Rough specimen.
Appearance: A treasure found here in the Black Hills of South Dakota, a great piece of Chalcedony. It will fluoresce bright green under SW/UV light.
Please Note: display photos are shot under various light settings.
Approximate measurements: LxWxH – 5 1/2″ x 2 1/4″ x 5″.
Availability: single specimen, exclusive.
In stock
Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of the minerals quartz and moganite. It has a waxy luster, and may be semitransparent or translucent. It can assume a wide range of colors, but those most commonly seen are white to gray, grayish-blue or a shade of brown ranging from pale to nearly black.
