Pyroxene (brown, one with nice twinning), leucite (rounded and withe at PPL and isotropic at XPL) in a tephrite from Rhine Graben, germany. PPL (plane polarised light) and XPL (cross polarised light) .#thinsectionthursday #tephrite #leucite #pyroxene #germany pic.twitter.com/2cIsgAcae0
— Alexstrekeisen (@alexstrekeisen) April 20, 2021
via Twitter https://twitter.com/alexstrekeisen
April 20, 2021 at 09:54PM
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