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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 6 3/4″ x 3 7/8″ x 2 5/8″ and weighs nearly 3 1/4 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

Weight3.25 lbs
Dimensions6.75 × 3.875 × 2.625 in

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