Day 276 : Chalcomenite (copper selenium oxide; blue) and umangite (copper selenide; violet-red) from Sierra de Cacho, just to the west of the Sierra de Umango (from where the name incorrectly comes), La Rioja, Argentina. Cotton collection, Keele.
Day 275 : Eucairite, silver copper selenide. From Skrikerum Mine, Valdemarsvik, Östergötland, Sweden. Cotton collection, Keele.
Day 274 : Linnaeite, cobalt sulphide, named after Carl Nilsson Linnæus (1707–1778), Swedish taxonomist, botanist, physician, geologist and zoologist. Sample from Müsen, Siegerland, North Rhine-Westphalia, Germany. Cotton collection, Keele.
Day 273 : On a field trip to Cheddleton in Staffordshire, England. This is the Carboniferous Cheddleton Sandstone formation at its type locality in a small quarry to the south of the town.
Day 272 : Cobaltite (cobalt arsenic sulphide) from Riddarhyttan, Skinnskatteberg, Västmanland, Sweden. Cotton collection, Keele.
Day 271 : Greenockite (cadmium sulphide) from Bishopton tunnel, Bishopton, Renfrew, Scotland. Cotton collection, Keele.
Day 270 : Keele Hall courtyard has cobble sets of basalt and Mountsorrel ‘Granite’ (hornblende granodiorite).
Day 269 : Calaverite (gold telluride) on fluorite from Cripple Creek, Coloroado, United States. Cotton collection, Keele.
Day 268 : Alabandite (manganese sulphide) from the Preciosa Sangre de Cristo Mine, Cerro Tlachiaque, Alchichica, Puebla, Mexico. Cotton collection, Keele.
Day 267 : Chalcopyrite and Barytes from the Mount Wellington Mine (Wheal Magpie), Twelveheads, Cornwall, England. Cotton collection, Keele.