1) Copper mineral 2) Tin mineral
Found on
https://www.crosswordclues.com/clue/kesterite
==Occurrence== It was first described in 1958 for an occurrence in the Kester deposit (and the associated localilty) in Yana basin, Yakutia, Russia, where it was discovered. It is usually found in quartz-sulfide hydrothermal veins associated with tin ore deposits. Associated minerals include arsenopyrite, stannoidite, chalcopyrite, chalcocite, sph...
Found on
http://en.wikipedia.org/wiki/Kesterite
No exact match found.
