I've been quietly participating in Mineral Cup so far but now that corundum is in danger, it's time to bring out the big guns. See here, the most beautiful rock on earth. With corundum. Unfortunately I do not know the source of the picture or the rock. Vote corundum!
Hello - I am new here. Geology professor with diverse interests pcwww.liv.ac.uk/johnwh/Websi...
A guided tour (courtesy of Jack Whattam, UiO) of Oslo’s Nordmarka and hundreds of millions of years of its fiery past! 🌋 … and a nice opportunity to meet @hugolantman.bsky.social in person!
🧵 Shortlist of Geosciences starter packs🧵 Share and let us benefit from the current growth to bring people (back) to @bsky.appgo.bsky.app/VFn34zWgo.bsky.app/ND4oS9k@alinemghilardi.bsky.socialgo.bsky.app/QWhLarC
Was leafing through some old pictures and feeling the need to share this one - it's a small outcrop from Southern Spain, basaltic-gabbroic rocks that have been metamorphosed. You can see the strong effect that the composition and texture of the initial rock has on the metamorphic product.
Bluesky needs some more cool geo images, so here's some orthopyroxene from a serpentinized peridotite (Semail ophiolite, Oman), seen with cross-polarised light in the optical microscope. The coloured patches seem to be exsolution features.
A beautifully exposed normal fault, featuring prof Luca Menegon pointing at the latest active fault plane
