This comes from the amazing quarry above Embleton. It was formerly quarried for roadstone. According to the BGS this is an Ordovician intrusion so it is old but not as old as the Skiddaw Group rocks into which it has intruded. Smith describes it as "speckled appearance ... moderately coarse". That fits with these samples. Diorite differs from granite in having a much higher plagioclase content.
