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BCR313 South Dakota Chalcedony

BCR313 South Dakota Chalcedony


  • This is an exceptional quality select Chalcedony rock from South Dakota. 
  • A great rock for cutting and any lapidary project.
  • It will fluoresce bright green under a SW/UV light. 
  • This particular specimen measures 8 1/2″ x 5 3/8″ x 2 3/4″ and weighs nearly 7 3/4 pounds.

MOHS hardness scale of  6.5 – 7


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Chalcedony is a cryptocrystalline form of silica, composed of very fine intergrowths of the minerals quartz and moganite. Chalcedony 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.

Additional information

Weight7.75 lbs
Dimensions8.5 × 5.375 × 2.75 in

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