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M803 South Dakota Chalcedony

M803 South Dakota Chalcedony


Here is a treasure found here in the Black Hills of South Dakota, a great piece of Chalcedony. The unique specimen measures 4 1/4″ x 3″ x 2 1/8″.  It will fluoresce bright green under a SW/UV light. Make it part of your mineral collection!  

Our UV Lamps

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.

Additional information

Weight1.25 lbs
Dimensions4.25 × 3 × 2.125 in

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515 1st Street
Keystone, SD 57751

Order: 1-866-354-0894
Information: 605-666-4813

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