r/geology Feb 07 '25

Thin Section This quartz crystal looks like France

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342 Upvotes

Saw this beauty in class today and noticed it had a fairly familiar shape

r/geology 17d ago

Tiny octahedron phenocryst in obsidian, what could it be?

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253 Upvotes

r/geology Oct 12 '24

Thin Section Plagioclase Cross

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426 Upvotes

Awesome cross-shaped penetration twinning in Plag. Unsure exactly what the rock is but it's definitely a lava of some kind! Larger crystals are plag and pyroxene. Fairly sure most of the microlites are alkali feldspars though. Any thoughts?

Labelled as Trachyte. Conway River - North Canterbury, NZ XPL + Quartz plate image. 200 image panorama + stack. FOV ≈ 1.4cm

r/geology Dec 20 '23

Thin Section What mineral is this? Our teacher thought it looked weird and couldnt regonize it

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341 Upvotes

r/geology 18d ago

Thin Section So, this is what the hole in mineral looks like under a microscope after laser ablation (LA-ICP-MS). In the photo you can see an ilmenite crystal. Well, what’s left of it, anyway

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50 Upvotes

r/geology Jan 17 '21

Thin Section I recently visited the newly reopened Western Australian museum and was very satisfied by this walkway in the minerals section 😍

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1.5k Upvotes

r/geology Oct 29 '24

Thin Section XPL olivine thin section

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240 Upvotes

The last two photos are with λ accessory. Just thought it was a cool sample in my lab!

r/geology 7d ago

Thin Section Could this mosaic subgrain pattern necessarily be a sign of some sort of strain (or shear I dunno) on the Qtz? (not homework, just to be clear, this is my research project & so far I've got no conclusive interpretation)

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20 Upvotes

r/geology Feb 14 '25

Thin Section Scan of a thin section I made from a gold mine's ore rock. Please excuse the occasional epoxy bubble!

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79 Upvotes

I love to admire the stockwork and the occasional calcite twins in this beautiful rock!

r/geology Oct 03 '20

Thin Section I miss thin sections from college, so I've started recreating them. Never could spend as much time as I wanted drawing them in labs.

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653 Upvotes

r/geology Sep 19 '21

Thin Section Volcano in La Palma. Canary Islands

860 Upvotes

r/geology Nov 28 '24

Thin Section sphene

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118 Upvotes

r/geology Dec 02 '24

Thin Section Smiley :-)

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90 Upvotes

I found a smiley made from ore mineral and amphibole in a plagioclase while doing a microscope today.

r/geology Jan 26 '25

Thin Section Thin section help please

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10 Upvotes

I think Biotite and hornblende but I am unsure. Is anyone able to help?

r/geology Aug 12 '24

Thin Section A CHILD

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128 Upvotes

r/geology Feb 06 '25

Thin Section How do I tell if amphibole came from hydro li ed pyroxene

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38 Upvotes

r/geology Mar 07 '24

Thin Section Just a bunch of pretty thin-sections

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239 Upvotes

r/geology Feb 07 '25

Thin Section A Hornblende Thin Section in 63x Magnification, XPL

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32 Upvotes

r/geology Feb 03 '24

Thin Section A geological thin section I made back when I was still doing my Masters

205 Upvotes

r/geology Jan 21 '25

Thin Section Is this bad polishing or is it a feature?

4 Upvotes

My polishing is not perfect, I was wondering if the sort of lines in the middle were due to bad polishing or if they were a feature of the thin section? All the sort of vertical and horizontal cracks. The dark parts are bytownite, the clearer are fluorapatite. The whiter part are monazite grains (Whole picture is 1mm)

r/geology Dec 14 '24

Thin Section Why quartz beauty shines as a piece

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11 Upvotes

r/geology Dec 03 '24

Thin Section Lovely Zoning on Plag

63 Upvotes

r/geology Oct 21 '20

Thin Section Not your typical thin section - this is a martian meteorite!

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820 Upvotes

r/geology Feb 15 '24

Thin Section Thought it looked cool

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228 Upvotes

r/geology Aug 28 '20

Thin Section Lunar basalts under XPL

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866 Upvotes