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M803 South Dakota Chalcedony with Calcite Crystal

M803 South Dakota Chalcedony with Calcite Crystal


Here is a treasure found here in the Black Hills of South Dakota, a great piece of Chalcedony with a Calcite Crystal center. The unique specimen measures 2 1/8″ x 1 1/8″ x 7/8″.  It will fluoresce bright green and under a SW/UV light while the Calcite will fluoresce orange. Make it part of your mineral collection!  

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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

Weight .25 lbs
Dimensions 2.125 × 1.125 × .875 in

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Keystone, SD 57751

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