#DogWalkingGeology Another loose rock from Ardalanish beach in SW Mull from this morning. This is a really distinctive rock, from the andesitic sills forming the lower part of the Glencoe volcanic sequence, 85km to the NE. Transported by glaciers. The purple alteration is partly hematite, but also distinctive pink manganese-rich epidote , which you can see in the core of the pale patch on the left of the cobble. #Geology#Mull#Glencoe
