Hugo van Schrojenstein Lantman
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hugolantman.bsky.social
Hugo van Schrojenstein Lantman
@hugolantman.bsky.social
800 followers 470 following 92 posts
Geology Postdoc at Utrecht University
Mechanical behaviour of minerals using nanoindentation

Fan of microstructures, petrology, metamorphism, fluids, subduction, earthquakes, stress and strain.
Occasionally takes pictures of rocks.
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Reposted by Hugo van Schrojenstein Lantman
hugolantman.bsky.social
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.
October 1, 2025 at 11:44 AM
Reposted by Hugo van Schrojenstein Lantman
sorosilicate.bsky.social
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
October 1, 2025 at 1:23 AM
hugolantman.bsky.social
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.
October 1, 2025 at 11:44 AM
Reposted by Hugo van Schrojenstein Lantman
mineralsocamerica.bsky.social
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
August 14, 2025 at 12:22 PM
Reposted by Hugo van Schrojenstein Lantman
mariabox.bsky.social
I always knew in theory that a speleothem is a sedimentary rock, but I've never seen a cross-bedded stalactite before 😂
July 15, 2025 at 12:40 PM
Reposted by Hugo van Schrojenstein Lantman
excitenetwork.bsky.social
🚨 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...
July 14, 2025 at 3:17 PM
Reposted by Hugo van Schrojenstein Lantman
vanhinsbergen.bsky.social
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
July 7, 2025 at 9:54 AM
Reposted by Hugo van Schrojenstein Lantman
robrizzo.bsky.social
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
June 18, 2025 at 9:54 AM
Reposted by Hugo van Schrojenstein Lantman
robrizzo.bsky.social
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...
May 8, 2025 at 9:13 AM
hugolantman.bsky.social
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.
May 1, 2025 at 3:01 PM
Reposted by Hugo van Schrojenstein Lantman
rockdeftud.bsky.social
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 😳😥
April 3, 2025 at 7:42 PM
Reposted by Hugo van Schrojenstein Lantman
vanhinsbergen.bsky.social
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
March 25, 2025 at 7:58 AM
hugolantman.bsky.social
Check out Stephen (et al.)'s latest paper!
stephenmichalchuk.com 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....
February 4, 2025 at 2:26 PM
Reposted by Hugo van Schrojenstein Lantman
peterlbowden1.bsky.social
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.
February 3, 2025 at 12:11 PM
Reposted by Hugo van Schrojenstein Lantman
peterlbowden1.bsky.social
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.
January 23, 2025 at 12:46 PM
Reposted by Hugo van Schrojenstein Lantman
frankiebutler.bsky.social
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.
January 16, 2025 at 10:52 AM
Reposted by Hugo van Schrojenstein Lantman
nishimoto.rocks
Pyroxene with exsolution lamellae in a gabbro from Susa, Yamaguchi, Japan.
January 2, 2025 at 10:47 AM
Reposted by Hugo van Schrojenstein Lantman
hugolantman.bsky.social
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
December 19, 2024 at 8:41 AM
Reposted by Hugo van Schrojenstein Lantman
cambridge-earthsci.bsky.social
Watch these snowflake-like dendritic clinopyroxenes twinkle as this thin section is rotated in cross-polarised light!❄️☃️ This is a rare volcanic rock called komatiite, from Gorgona. Credit: Charlie Gordon. #ThinSectionTuesday #Petrology #Mineralogy
December 17, 2024 at 9:25 AM
hugolantman.bsky.social
Today is my first day as postdoc at Utrecht University! For the next three years, I will be focusing on the mechanical behaviour of minerals in various settings using nanoindentation, as part of EPOS-eNLarge and working with Dr Alissa Kotowski. Excited to get started!
December 2, 2024 at 10:53 AM
Reposted by Hugo van Schrojenstein Lantman
carlatb.bsky.social
📣open PhD Position📣 We’re looking for a PhD student to experimentally investigate the role of aqueous fluids in the transfer of carbon in subduction zones at @unimuenster.bsky.social🇩🇪 in collaboration with the University of Perugia🇮🇹. More info here stellen.uni-muenster.de/jobposting/7...
Münster Perugia
November 28, 2024 at 9:47 AM
Reposted by Hugo van Schrojenstein Lantman
geohenning.bsky.social
I'm considering giving these historic books away. Saved them from being thrown away. Maybe there's an institute, library or individual here who could use them...

⚒️ 🧪 #Geology @ingvterremoti.bsky.social
geohenning.bsky.social Henning @geohenning.bsky.social · Jun 13
Just for a few bucks I had to buy these books 📚 from 1906-1911, although they're in Italian. 😅 "Observed earthquakes in Italy" by Dr Giuseppe Martinelli. Here's an example for the 1906 #earthquake in San Francisco. ⚒️ #Geology 🧪 @joserodribeiro.bsky.social @jhgurneyquakes.bsky.social
Six books called Terremoti in Italia from 1906 to 1911 First page of the book Terremoti osservati in Italia in 1906
November 27, 2024 at 12:51 PM
hugolantman.bsky.social
Today: geology meets archaeology! This is what we call a "hunebed" in Dutch: a neolithic burial structure built by people of the Funnelbeaker culture between ~3400-3000 BC. Many are found across the northern Netherlands and parts of Germany and Denmark. But what are they made of?
Hunebed D50, a neolithic burial structure in a grassy field surrounded by trees, near the Dutch town of Noord-Sleen. An inner ring of half buried large rocks is covered by horizontal flat rocks. This structure is surrounded by a second ring of half-buried rocks. Initially these rocks would have been covered by a mound of soil. Many hunebedden were built east-west with the entrance facing south. Hunebed D50, the same one as the previous picture, within the outer ring of half buried rocks. We see five half-buried rocks in the foreground, all covered by flat horizontal rocks that are also supported by more half-buried rocks in the back, out of view. Behind these rocks are trees.
November 27, 2024 at 10:54 AM
Reposted by Hugo van Schrojenstein Lantman
sheared-sash.bsky.social
So strong and yet so weak: Look at this beautiful 'weak' shear zone in a 'strong' gabbro from western Norway. Can't wait to get back to the field in the summer! 🧪⚒️
Photgraph of a weak shear zone (deformed rock) in a strong gabbro (non-deformed rock). The shear zone is a approximately 10 cm thick. A coin (5 Norwegian krone) is in the image for scale. Image was taken in western Norway.
November 26, 2024 at 11:52 AM
Reposted by Hugo van Schrojenstein Lantman
sheared-sash.bsky.social
Are you interested in how deformation and metamorphism interact? Consider submitting an abstract to our session at #EGU25 ⚒️🧪

meetingorganizer.copernicus.org/EGU25/sessio...

Deadline to apply for travel support is om the 2nd of december!
Banner advertising session GMPV3.2 at EGU25 general assembly titled: How deformation and metamorphism interact: insights into thermal-hydrological-mechanical-chemical feedbacks in nature and experiments The conference will be in Vienna, Austria and online between 27 April and 2 May 2025.
November 19, 2024 at 4:03 PM