This major element map shows flow banding in a lava-like ignimbrite from central Arran. Blue crystals are quartz, turquoise are plagioclase, purple are alkali feldspars. #ThinSectionThursday pic.twitter.com/fyR4rSbxzV
— Bob Gooday (@BobGooday) May 14, 2020
via Twitter https://twitter.com/BobGooday
May 14, 2020 at 09:34PM
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