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Reposted by Hugo van Schrojenstein Lantman

Hugo van Schrojenstein Lantman @hugolantman.bsky.social · 7d

Since kyanite made it to the final of Mineral Cup, I decided to contribute. Vote kyanite!

Not only is kyanite gorgeous, it's also a key metamorphic index mineral and thus one of my favourite minerals to find. Here are a few examples I've come across.

See alt text for details

#MinCup25 #kyanite

A single crystal of blue kyanite on a matrix of white quartz. From the Betic Cordillera, Spain

A green-blue kyanite eclogite with a reddish vein of garnet, bordered by more dark blue kyanite. From Pohorje, Slovenia. 2 euro cent coin for scale.

Bright blue specks of kyanite in a gray-white matrix. These rocks are originally granulite of the Baltica basement, locally transformed to eclogite. From Holsnøy, Norway

One of the most confusing samples I have ever found, this rock consists entirely of white kyanite, muscovite and quartz - here pictured on top of a red notebook with a mechanical pencil as scale. The orange colour seems to be iron oxide from the surroundings. Before finding this, I did not know that kyanite could be white! From the Betic Cordillera, Spain.

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DL Whitney @sorosilicate.bsky.social · 8d

I’m very excited that #tugtupite made it to the finals but can it do this? Folded #kyanite in a high-pressure quartzite, western Türkiye. #MinCup25

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Hugo van Schrojenstein Lantman @hugolantman.bsky.social · 7d

Some bonus #kyanite pictures #MinCup25

A single crystal of blue kyanite. This crystal contains kinks, visible as lines within the crystal, and are the result of deformation. Some white quartz matrix is visible in the background.

Two blades of blue kyanite in a garnet-phengite-quartz rock. The phengite is visible as silvery shimmering patches, the graphite is greyish, and the few garnet are small red-brown roundish crystals mostly in the left of the specimen.

A blue-white kyanite-quartz lens in an outcrop of gray graphitic schist. A camera case in the bottom of the image provides a rough scale.

Close-up of a white-gray schist outcrop containing abundant garnet (orange circular crystals), a few blue kyanite crystals, and plenty of white quartz and silvery mica. The metal spike in the left of the image is the tip of a rock hammer.

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Hugo van Schrojenstein Lantman @hugolantman.bsky.social · 7d

Since kyanite made it to the final of Mineral Cup, I decided to contribute. Vote kyanite!

Not only is kyanite gorgeous, it's also a key metamorphic index mineral and thus one of my favourite minerals to find. Here are a few examples I've come across.

See alt text for details

#MinCup25 #kyanite

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Reposted by Hugo van Schrojenstein Lantman

Mineralogical Society of America @mineralsocamerica.bsky.social · Aug 14

Thin Section Thursday!
A fractured olivine (~3 mm) in basalt. It shows undulatory extinction suggestive of plastic deformation, implying that the grain is a xenocryst entrained from surrounding peridotites. Thanks @tectonic_city. #thinsectionthursday #olivine @tectonic_city @officialcsusbgeology

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Hugo van Schrojenstein Lantman @hugolantman.bsky.social · Jul 24

I have had relatively little to share, as of late. Hope to become more active in the future, though.

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Maria Box @mariabox.bsky.social · Jul 15

I always knew in theory that a speleothem is a sedimentary rock, but I've never seen a cross-bedded stalactite before 😂

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excitenetwork.bsky.social @excitenetwork.bsky.social · Jul 14

🚨 Thu 17 July: webinar at 12 noon CEST! 🚨Join Lotta Ternieten for her journey to groundbreaking findings on the early transformation of iron released from hydrothermal vents at the Mid-Atlantic Ridge. 🌊⚙️
👉 Register and find out how we can help you! — events.teams.microsoft.com/event/893d39...

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Douwe van Hinsbergen @vanhinsbergen.bsky.social · Jul 7

Really happy with this paper with my buddies Tom & Carl. Started with online discussions during Covid lockdowns and is now published in Tectonics:

"Lithospheric Unzipping Explaining Hot Orogenesis During
Continental Subduction"

agupubs.onlinelibrary.wiley.com/doi/epdf/10....

Lithospheric Unzipping Explaining Hot Orogenesis During Continental Subduction

agupubs.onlinelibrary.wiley.com

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Roberto Rizzo @robrizzo.bsky.social · Jun 18

Exciting news! Our new paper, "Carbonation and deformation of oceanic serpentinites in the Elba subduction channel: Evidence for fluid-rock interaction at seismogenic depth," is now #OpenAccess in Earth and Planetary Scientific Letters! ⚒️
authors.elsevier.com/sd/article/S...

ScienceDirect.com | Science, health and medical journals, full text articles and books.

authors.elsevier.com

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Hugo van Schrojenstein Lantman @hugolantman.bsky.social · May 15

Gorgeous! Is that a sheared coronitic granulite?

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Roberto Rizzo @robrizzo.bsky.social · May 8

Our latest research is hot off the press! ⚒️

We've captured amazing footage of #Hydrogen gas moving through #Rock in real-time - think of it like making a movie of something that normally happens deep underground where no one can see it.

Article link: doi.org/10.1016/j.jc...

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Hugo van Schrojenstein Lantman @hugolantman.bsky.social · May 1

Bit of an unusual #ThinSectionThursday
Over the past weeks, I've been busy collecting data with the Triboindenter, performing deformation experiments on grains in thin sections. See below a topography 3D model of one of these indents (looks like a crater), also collected with the indenter.

A three-dimenisonal graph showing a yellowish surface, representing the topography of a mineral grain. In the center is a crater-like feature, an indent that is the result of a nanoindentation experiment. The topography map is 15 micrometers by 15 micrometers, and the topography is in the order of 10s to ~100 nanometers.

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RockDefTUD @rockdeftud.bsky.social · Apr 3

Amidst all terrible news, I am sad that here it is not better. Today the VU Amsterdam announced they'll cut Earth Sciences, and fire 39 staff. 130 students are left to figure out how to finish, and an unknown number of PhDs lose their supervisors. My heart goes out to my colleagues 😳😥

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Douwe van Hinsbergen @vanhinsbergen.bsky.social · Mar 25

Europa heeft geologen en milieuwetenschappers nodig, terwijl Nederland juist daarin snijdt. Op dit moment wordt 3% van de 'Critical Raw Materials' die Europa nodig heeft, hier gewonnen. De EU wil dat in de komende vijf jaar verdrievoudigen, en wel volgens Europese standaarden. Dat vergt kennis 1/n

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Hugo van Schrojenstein Lantman @hugolantman.bsky.social · Mar 12

Brilliant, congratulations!

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Hugo van Schrojenstein Lantman @hugolantman.bsky.social · Feb 13

The Northeast of Corsica is part of the Alpine orogeny, and is similar to the "Schistes Lustres" of the Alps. There's a lot of blueschist and eclogite facies rocks there, including peridotite. Let me know if you'd like some literature.

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Hugo van Schrojenstein Lantman @hugolantman.bsky.social · Feb 4

Check out Stephen (et al.)'s latest paper!

Stephen Michalchuk @stephenmichalchuk.com · Feb 4

🚨 Hot off the press 🪨 ⚒️ Where do you come from, where do you go 🎶 fluids that is… after an earthquake in the dry lower crust? We look into this and more using SEM-CL, EBSD, EMPA, STEM, and FTIR!

Hit the link below 👇

agupubs.onlinelibrary.wiley.com/doi/full/10....

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Pete Bowden @peterlbowden1.bsky.social · Feb 3

A beautiful example of an Outer Hebrides dyke cutting the foliation in Archaean #Lewisian gneiss. Although folded by later Laxfordian deformation both the dyke and a thin apophysis exhibit near perpendicular angular discordance in the fold hinge, becoming concordant in the limbs.
Isle of Harris. ⚒️🧪

A black Outer Hebrides dyke cuts across the pre-existing foliation in grey Archaean Lewisian gneiss. Thin apophysis (offshoot) and the hinge zone of the folded dyke exhibit near perpendicular angular discordance to the foliation.
These rocks were folded during Laxfordian deformation and strong flattening in the limbs of the folds brought the contact of the dyke and the foliation into concordance.
This outcrop is located west of the village of Rhenigidale, Isle of Harris, Outer Hebrides.

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Hugo van Schrojenstein Lantman @hugolantman.bsky.social · Feb 1

Same here from the Netherlands last night

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Pete Bowden @peterlbowden1.bsky.social · Jan 23

My OH is a keen walker and getting quite good at photographing interesting geological locations. This has gone to the top of my Spring excursion list.

Pink #Laxfordian granitic intrusions invading #Lewisian gneisses and amphibolites.

Mangersta, #IsleofLewis ⚒️🧪

Tall grey cliffs being battered by a rough sea. Older grey Lewisian gneisses and black amphibolites are intruded by salmon-pink granitic pegmatites and aplites of Late-Laxfordian age.
The cliffs are located near the Mangersta bothy on the west coast of the Isle of Lewis, Scotland.

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Frankie Butler @frankiebutler.bsky.social · Jan 16

I am reaching out to the #geoscience community - I need help.

My MSc thesis was curtailed due to being unable to even access the building @ my previous university♿️ they provided no alternative.

They’ve taken no responsibility for this #discrimination after I submitted an appeal.

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Shoji Nishimoto / 西本昌司 @nishimoto.rocks · Jan 2

Pyroxene with exsolution lamellae in a gabbro from Susa, Yamaguchi, Japan.

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Hugo van Schrojenstein Lantman @hugolantman.bsky.social · Dec 19

Also metamorphic rocks can have really cool Fe-Ti oxides! I found this cluster with intergrowths of Ti-magnetite and Mn-ilmenite (white & grey lines resp.), and rutile with non-Mn-ilmenite exsolution (grey & white lines resp.), in garnetite from Lago di Cignana.

A grayscale image taken with the backscattered electron detector of a scanning electron microscope. The image consists of various blobs of dark and bright grays with occasionally lines and dots throughout the blobs. Each brightness level corresponds to a mineral, in this case Fe-Ti-oxides and garnet. On the left-hand side is a large bright grain of Ti-magnetite with irregular lines of intermediate gray, Mn-ilmenite. On the right-hand side is a darker gray grain with white speckles and a few straight white lines, this is a grain of rutile with ilmenite inside.

A zoomed-out version of the previous image; there is more dark grey (garnet) surrounding the Fe-Ti-oxides

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Hugo van Schrojenstein Lantman @hugolantman.bsky.social · Dec 19

Also metamorphic rocks can have really cool Fe-Ti oxides! I found this cluster with intergrowths of Ti-magnetite and Mn-ilmenite (white & grey lines resp.), and rutile with non-Mn-ilmenite exsolution (grey & white lines resp.), in garnetite from Lago di Cignana.

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