• Silver in chalcedony nodule, in banded chalcedony and amethyst ("sowbelly agate") 

        Author(s):Raines, Ed; Mines Museum of Earth Science
        Date:2017
        Format:born digital; digital photographs
        Cut slab polished on both sides ; one of six slices cut from the same piece of “sowbelly”. Mineral specimen is from the Last Chance mine ("Chance cave", 700' level), Amethyst vein, Creede mining district, Colorado.
      • Quartz, variety amethyst with quartz variety chalcedony; carved sowbelly agate sphere 

        Author(s):Raines, Ed; Mines Museum of Earth Science
        Date:2017
        Format:born digital; digital photographs
        Polished sowbelly agate sphere (quartz variety amethyst with quartz variety chalcedony) from the Last Chance mine, amethyst vein, Creede mining district, Colorado.
      • Quartz, variety amethyst 

        Author(s):Raines, Ed; Mines Museum of Earth Science
        Date:2017
        Format:born digital; digital photographs
        Quartz, variety amethyst from the Amethyst vein, Creede mining district, Colorado, forming a vug in amethyst vein material.
      • Quartz, variety amethyst on barite 

        Author(s):Raines, Ed; Mines Museum of Earth Science
        Date:2017
        Format:born digital; digital photographs
        Light purple amethyst crystals covering and replacing barite. Mineral specimen is from the Bulldog mine, Bulldog vein, Creede mining district, Colorado.