The #olivine xenocrysts in this mantle-xenolith-bearing basalt belong to the orthorhombic #crystal system. This explains why, as the stage is rotated under #XPL, olivine goes extinct parallel with N-S & E-W axes.
— Melissa Scruggs (@VolcanoDoc) April 25, 2019
4x mag, #ThinSectionThursday pic.twitter.com/CXQqvDNZlm
via Twitter https://twitter.com/VolcanoDoc
April 25, 2019 at 10:40PM
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