Rock 366 : Day 296 : Calcite
Day 296 : Calcite from Guanajuato, Mexico. Cotton collection, Keele.
Rock 366 : Day 295 : Wrekin Quartzite
Day 295 : Second day at Ercall Quarries, Shropshire. Here the Lower Cambrian glauconitic Lower Comley Sandstone Formation overlies the Wrekin Quartzite Formation.
Rock 366 : Day 294 : Ercall Granophyre
Day 294 : Field course to Ercall Quarries, Shropshire, England. Late Precambrian Ercall Granophyre overain unconformably by the basal breccio-conglomeratic facies of the Lower Cambrian Wrekin Quartzite Formation.
Rock 366 : Day 293 : Hydrozincite and Calcite on Limonite
Day 293 : Hydrozicite (a zinc carbonate) with calcite on limonite from Durago, Mexico. Cotton collection, Keele.
Rock 366 : Day 292 : Aragonite
Day 292 : Aragonite found in Triassic marls from Minglanilla, Cuenca, Castile-La Mancha, Spain. Cotton collection, Keele.
Rock 366 : Day 291 : Serpentinite
Day 291 : Sepentinite from The Lizard, Cornwall. Cotton collection, Keele.
Rock 366 : Day 290 : Metatorbernite
Day 290 : Metatorbernite (hydrated copper uranyl phosphate) from Gunnislake Mine, Gunnislake, Calstock, Callington District, Cornwall, England, UK. Cotton collection, Keele.
Rock 366 : Day 289 : Topaz
Day 289 : Topaz from Thomas Range, Juab Co., Utah, USA. Cotton collection, Keele.
Rock 366 : Day 288 : Ilvaite
Day 288 : Ilvaite (calcium iron sorosilicate) named after the former name of the island of Elba. This sample from Rio Marina, Elba, Italy. Cotton collection, Keele.
Rock 366 : Day 287 : Chalcophanite
Day 287 : Chalcophanite, a zinc, manganese hydroxide. The name implying copper (literally ‘brass appears’) seems to relate to the colour when burnt. From Ojuela Mine, Mapimí, Durango, Mexico. Cotton collection, Keele.