“Pig’s Eggs” are a pseudomorph of fine-grained muscovite (“sericite”) with kaolinite (and minor quartz, biotite, etc.) after orthoclase, found in kaolinised granite such as that found at Goonbarrow.
Goonbarrow China Clay Pit, Bugle, Cornwall
In the heart of Cornwall lies a landscape unlike any other in Britain: the stark, white, terraced pyramids of the St Austell china clay district. At the centre of this…