Many of us have used Oreo cookies as analogues when explaining plate tectonics, but all this time, "Geo" cookies existed! Who knew?!? What a wasted opportunity. 😁
#GeoEducation

This fold in chlorite was not produced by tectonic processes, but by the hands of an iron-age craftsman shaping clay into pottery. Interesting perspective for a geologist like me! I'm enjoying my foray into #archeology. :)
#FridayFold

It's been a while, but I just found this "spherulitite" thinsection from the Oslo rift area in our teaching collection and thought that's my sign to contribute to #ThinsectionThursday again! 😃

Great fun to see #ElectronMicroscopy images acquired in the Goldschmidt laboratory at @uio.no in petri dishes as part of an art installation!
Artist Ann Edvartsen Hay worked on mineral extraction and its effects on nature and communities:
bodiesofextraction.com

#ArtAndScience

A colleague asked for my help in polishing a thin section on short notice. I am quite busy, but who could say no to such a beautiful sample? 🤩
#ThinsectionThursday

Fantastic #FieldworkFriday with my petrology students today! We are lucky to have so much exiting geology here around Oslo. Today's focus: intrusive relationships between basalt and syenite, volcaniclastics, and a tiny bit of contact metamorphism.

Look at those interference colour fringes 🌈 in calcite! By focusing through the grain I can count eight orders.
#ThinsectionThursday #Microscopy

A serpentinite mesh texture for #ThinsectionThursday. Or is it a piece of modern art? 🖌️
Note how there are several generations of serpentine, among them a clear one that filled the first fractures, and a dark one (full of magnetite) that replaced the rest of the olivine.

I just pasted this photo into a powerpoint, and the #AI-generated AIt Text is "A person drawing a fish on a rock". 😂 Pretty accurate description!
#geology

I have used this garnet mica schist for teaching for years, but never noticed how beautifully the interference colours highlight the foliation (and the varying thickness of the thinsection). Having a scan of the whole section really changes one's perspective.
#ThinsectionThursday

I don't often work with igneous rocks, but they do have cool microstructures, too!
Skeletal Fe-Ti-oxide grains with lots of exsolution lamellae. (Width of image is ca 40 µm.)
#ThinsectionThursday

Some beautiful interference colours for this week's #ThinsectionThursday. :)

For my first #ThinsectionThursday under the blue sky, one of my favourite micrographs: A serpentine pseudomorph after carbonate?
The mineral with the grey interference colours is serpentine which apparently preserves the cleavage of a pre-existing carbonate.

I usually prefer working with thinsections, but sometimes 3D samples are fun as well!
Here some gypsum growing in black shale from Oslo.
Field of view ca 10 µm.
#electronmicroscopy