#ThinSectionThursday You can't have too many Rum rocks: colourful olivines in a large greyish plagioclase oikocryst, U5, E. Layered Int. http://pic.twitter.com/Y7uajzWWfk
— John Faithfull (@FaithfullJohn) April 27, 2017
via Twitter https://twitter.com/FaithfullJohn
April 28, 2017 at 01:51AM
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