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Day 256 : Domeykite (copper arsenide) from Cerro de Paracatas, Tlalchapa, Guerrero, Mexico. Cotton collection, Keele.

Day 255 : Tennantite (copper-arsenic sulphide) from Wheal Jewel Mine, Gwennap, Redruth, Cornwall. Cotton collection, Keele.

Day 254 : Stuck at home so sample from my shelves. This is a depression in Kidderminster Formation sandstone created by the impression of a ‘Bunter’ pebble. Park Hall Quarry, Staffordshire.

Day 253 : Hollandite (barium-manganese oxide) from Jhabua, Madhya Pradesh state (probably the Kajlidongri Manganese Mine) in central India. Cotton collection, Keele.

Day 252 : Colusite (Copper-vanadium-arsenic sulphide) from East Colusa Mine, Berkeley Pit, Butte, Montana, United States. Cotton Collection, Keele.

Day 251 : Tetrahedrite, locality unknown. Cotton collection, Keele.

Day 250 : Stephanite (Silver-antimony sulphide) from Friberg, Saxony, Germany. Cotton collection, Keele.

Day 249 : Stannite, the name indicating its tin content (Latin – stannum; source of the abbreviation Sn). From Cornwall, England. Cotton collection, Keele.

Day 248 : Bournonite (copper, lead, antimony sulphide) from Neudorf, Harzgerode, Harz, Saxony-Anhalt, Germany. Cotton collection, Keele.

Day 247 : Tetrahedrite from Herodsfoot Mine, Lanreath, Liskeard District, Cornwall, England. Cotton collection, Keele.