Most of the beads have 'seams', lines on the cerussite
core which are composed of more compact crystals of pyromorphite, sometimes projecting from the cerussite
surface and appearing as a ridge.
Ore minerals include gold, silver, chalcopyrite (CuFeS2), galena (PbS), bornite (CuFeS4), covellite (CuS), chalcocite (Cu2S), anglesite (PbSO4), sphalerite (ZnS), argentite (Ag2S), cerussite
(PbCO3) and smithsonite (ZnCO3).