Quartz, variety amethyst with quartz variety chalcedony; carved sowbelly agate sphere

Abstract

Polished sowbelly agate sphere (quartz variety amethyst with quartz variety chalcedony) from the Last Chance mine, amethyst vein, Creede mining district, Colorado.

For more information about the Minerals of Creede, Colorado and the collection, see: http://libguides.mines.edu/GeologyMuseum/digitalcollectionsCreede.