Cancrinite is a mineral which should be crap, but managed to be brilliant, thanks to birefringence π https://t.co/q04RBbmudB
— John Faithfull ππͺπΊπ΄σ §σ ’σ ³σ £σ ΄σ Ώ (@FaithfullJohn) May 8, 2021
via Twitter https://twitter.com/FaithfullJohn
May 08, 2021 at 10:14PM
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