Shatter Cone Fragment in Carbonate Rock

This specimen is a geological fragment known as a shatter cone, which is a rare geological structure formed only in the bedrock beneath meteorite impact craters or at underground nuclear explosion sites. The item measures approximately 3 to 4 inches in length, fitting comfortably in the palm of a hand. It exhibits a distinct conical shape with characteristic 'horsetail' striations or flutings that radiate from an apex. The coloration is primarily a deep, earthy brownish-red to dark gray, likely due to high iron or manganese content within the sedimentary or metamorphic host rock. The texture is rough and matte, displaying the high-pressure shock metamorphism that created the fan-like patterns. Most of the cone is intact, though there are jagged, irregular edges along the perimeter where it was broken from a larger rock mass. The surface shows some light superficial wear and minor chipping consistent with field collection. There are no maker's marks, as this is a natural (impact-driven) occurrence. These structures are of significant scientific interest to collectors of meteoritical and geological rarities for their diagnostic role in identifying ancient impact sites.