@FaithfullJohn I've the first edition (published 1980) that was the textbook for learning igneous petrology back sometime in the 1980's...

#IgneousPetrology #PhaseDiagrams #Basalts #ExperimentalPetrology

For #WaterfallWednesday, a picture of a #waterfall in #Iceland with some lovely #columnar #basalts. I distinctly remember how cold, dark and wet it was that day but I don’t have a clue which specific waterfall this is or where it is located…

Out past the Lighthouse at Rubha nan Gall again. Dry today. Rocks there are full of some quite large amygdales - mainly quartz and calcite I think. Mentioned in the BGS Memoir. These are low in the sequence lavas - the underlying Jurassic sediments are not far below. Just a little bit further north there are outcrops of Jurassic rocks. Lighthouse approach is made from a red Jurassic sandstone quarried nearby #Mull #geology #basalts #amygdales #calcite #quartz