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Day 302 : Appinite (hornblende-rich potassic lamprophyre) from Aonach Eagach, Glencoe, Scotland. From the Caledonian Etive Dyke Swarm. Keele collection.

Day 301 : Almost caught out today with a flat camera battery. This is taken with my iPhone on Keele Campus where a small landslip occurred in the Clock House Drive cutting through the Upper Carboniferous (Westphalian D – Moscovian) Butterton Sandstone Formation.

Day 300 : I’ve reached the milestone of 300 rocks – this is one of my favourite samples from my personal collection. It is a granite pegmatite with huge feldspar and biotite crystals. It was collected on a Keele field course to Norway in 1991 from the Narestø Feldspar Quarry, …

Day 299 : This is a quartz meladiorite from Skene in Aberdeenshire, Scotland. Keele collection.

Day 298 : A hornblende biotite quartz diorite from the Bordeaux Diorite Complex of North Guernsey, Channel Islands. Keele collection.

Day 297 : Second day in the field at the Ercall Quarries. This is the Lower Cambrian Wrekin Quartzite Formation.

Day 296 : In the field at the Ercall Quarries, Shropshire. This is flow-banded Late Precambrian Uriconian rhyolite.

Day 295 : A coarse quartz hornblende diorite from the head of Glen Dubh, Arran, Scotland. Keele collection.

Day 294 : A mixed diorite from the central vent complex on the Isle of Arran, Scotland. Keele collection.

Day 293 : Appinite, a subset of lamprophyre, is a potassic, hornblende rich igneous rock. This is from the Malvern Hills, England. Keele collection.