The Yttrium episode of Periodic Videos (https://www.youtube.com/watch?v=NxbOQ1FhqdQ) managed to relieve me of a rarefied torment originating from the Hyperion audiobook, where Dan Simmons is always on about a "lapis lazuli" sky. This term is almost impossible to google if you've only heard it spoken.
That is not, of course, the most interesting thing about either the video or the book, but I am now going to rest easy.
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