$18.00
M817: South Dakota Chalcedony – Locality: South Dakota. Selection: Rough specimen.
Appearance: A treasure found here in the Black Hills of South Dakota. It will fluoresce bright green color under a SW/UV light.
Please Note: display photos are shot under various light settings.
Approximate measurements: LxWxH – 6″ x 1 7/8″ x 3 1/2″.
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.
