Striped chalcedony (4)
I believe the answer is:
onyx
(Other definitions for onyx that I've seen before include "Smooth stone with bands of colour" , "Hard stone with coloured layers" , "Quartz used as a gem" , "Kind of agate" , "Stones" .)
I believe the answer is:
onyx
(Other definitions for onyx that I've seen before include "Smooth stone with bands of colour" , "Hard stone with coloured layers" , "Quartz used as a gem" , "Kind of agate" , "Stones" .)