Rock 366 : Day 236 : Polybasite
Day 236 : Polybasite (one of the ‘ruby silvers’) from Chile. Cotton collection, Keele.
Rock 366 : Day 235 : Enargite and Pyrite
Day 235 : Pyrite and enargite (copper arsenic sulphide) from Butte, Montana, United States. Cotton collection, Keele.
Rock 366 : Day 234 : Proustite
Day 234 : Proustite (silver arsenic sulphide). Has to be kept in closed box as vermillion red colour will darken. Locality unknown, Cotton collection, Keele.
Rock 366 : Day 233 : Native Mercury
Day 233 : Native mercury from Almadén, Ciudad Real, Castile-La Mancha, Spain. Cotton collection, Keele.
Rock 366 : Day 232 : Native Arsenic
Day 232 : Native arsenic from Burraton Coombe Quarry (now a pond in a private residence), St Stephens by Saltash, Cornwall. Cotton collection, Keele.
Rock 366 : Day 231 : Native Tellurium
Day 231 : Native tellurium. Locality unknown. Cotton Collection, Keele.
Rock 366 : Day 230 : Gold and Silver Amalgam
Day 230 : Gold and Silver Amalgam from the Comstock Lode, Nevada, United States. Cotton Collection, Keele.
Rock 366 : Day 229 : Native Bismuth
Day 229 : Native bismuth from Kingsgate, New England Range, New South Wales, Australia. Cotton Collection, Keele.
Rock 366 : Day 228 : Native Sulphur on Calcite
Day 228 : Native sulphur on calcite, Racalmuto, Sicily. Cotton Collection, Keele.
Rock 366 : Day 227 : Gold on Quartzite
Day 227 : Gold on quartzite from the Claremont Mine, Zimbabwe. Cotton Collection, Keele.