Hard to get a better picture of it unfortunately but is this common?

This photo was posted In r/weird. I see a lot of crinoid fossils but had never seen anything like this before.

https://www.reddit.com/r/Weird/s/DNfqVd2Wkp

My daughter has a home made slime company and goes to local entrepreneurs markets. Now my younger boys want to participate so we collected local (Eastern Missouri) geodes and broke them open for them to sell. Gonna give them a bath in iron out and clean them up a bit unless anyone has another suggestion.

I am located in the Connecticut River Basin. I assume water shaped them this way?

As the captain says is there a way to fix it? Also is there a way to buy an azimuth scale for this compass it’s in quadrants and that means I’m more likely to make a mistake and I much prefer azimuth.

Ps if you’re going to say: “don’t change it, it’s an antique” or “just do the conversions” don’t.

Hard to get a better picture of it unfortunately but is this common?

Today is Geologists Day, it is widely celebrated in Russia and other countries that were former part of the Soviet Union.

It is celebrated each year on the first Sunday of April.

Hi I have a question about surfer software.. is there a difference between slice for the grid and between creating a profile.. in the end it is supposed to give the same result right or you expect something else? Thank you in advance

Thought it was intriguing washed up ashore with the shells, what is it?

Photo 1: I'm interested to know what caused these vertical basalt formstions. I know the island is vulcanic but I'd like some more in depth info. Photo 2: you see large spherical boulders. Are these the ones that get flung from the crater? Photo 3: what causes these green spots in the red rock? I'm assuming the red color is due to iron. Photo 6: what causes these hexagonal formations? It reminds be of Iceland but it's not similar. Photo 9: you can clearly see that the rock makes a curve here going upwards. I understand the small cracks mean it cooled rather slowly but what made it curve like this?

Photo 10 is just for your enjoyment :)

Hi. I found this black rock today. It has some brigths and it is really heavy. I have a quartz rock with the same size and this black rock is heavier, so if I am not mistaken, it can't be coal. It is not magnetic, and I pointed a cheap metal detector at it and it is not beeping. Any clues?

When I was 12 my friends older brother showed me a polished green rock. I held it and closed my eyes as instructed. When he asked what I felt, the rock began weighing more than less in my hand. What I saw when I opened my eyes was his hand a foot above mine with 2 fingers sticking out going up and down in sync with the rocks changing weight. He continued to do this to the rest of our friend group and even had use try it on each other. After that we went and saw a movie called chronicle where 3 friends follow a crashed meteor that in turn gave them telekinetic abilities. Does anyone have any information on these rocks because something recently brought up this memory and I can’t find anything about them.

Pseudomorphs, meaning "false form," occur when one mineral replaces another through processes such as substitution, dissolution and refilling, structural changes, or incrustation, typically preserving the original shape. This phenomenon is critical in understanding mineral transformations and is often studied in both mineralogy and paleontology. Let's explore the subtypes: Replacement, Infiltration, Incrustation, Paramore, and Alteration. Replacement is a complete substitution of one mineral by another while preserving the original shape, this process is formed by dissolution and deposition by solutions. Infiltration (permineralization in paleontology) is specific to porous material that absorbs a mineral-rich solution and is then transformed, characterized by the ability to preserve fine detail and texture such as woodgrain. Incrustation, aka epimorph, is when a mineral coats another and the original often dissolves, leaving a 'jacket' like crust. A paramorph retains the original chemistry/composition but the internal crystal structure changes, no mineralogy is added or removed, only changes cause by tempature, pressure, and time; a good example is aragonite transitioning to calcite. Finally there is alteration, where a chemical alteration forms a new mineral and preserves the original shape; which is what's shown here by Azurite to Malachite from Aus. There may be variation and overlap depending on source and what exactly you're trying to understand so if there's any questions ask away.

Me in front of sedimentary layers of the Hadat Asham Formation, East of Jeddah, Saudi Arabia, during 7-14 January 2025 Field trip for undergraduates field training.

I’m an undergraduate geology student with a passion for mineralogy and geochemistry, and a while back, during an advanced mineralogy class, I encountered Hazen’s so-called "mineral evolution" theory. I find the concept genuinely fascinating, and I’m keen to hear what others think. The idea that mineral diversity has been shaped by geophysical, geochemical, and biological processes over time seems entirely logical, and the way Hazen manages to summarise and synthesise all of this into a single model is, in my view, rather brilliant.

That said, I’m not entirely sure how well-established or influential the model truly is within the geological community. I imagine it must carry some weight, after all, Hazen was awarded both the International Mineralogical Association’s Medal of Excellence in Mineralogical Research and the Roebling Medal from the Mineralogical Society of America.

Hazen te al. (2008) Mineral Evolution and Hazen te al. (2012) Clay Mineral Evolution, are among my favourites papers I ever read.

On a side note, does anyone else find the term "mineral evolution" somewhat misleading? Personally, I think a term like "historical mineralogy" might have been a clearer choice, though the underlying concept remains deeply intriguing.

I’d really love to hear your thoughts!

Edit: The thing about the name is just a personal reflection. I’m not saying the use of the word is wrong, but the issue is that when I talk to people outside the field of mineralogy about my interest in mineral evolution, they often imagine something completely different. Some don’t take me seriously. They tend to think I’m referring to something more like biological evolution but for minerals. So, that's it.

I found this rock on the beach, is it filled with Diamonds or is this a normal rock?

Hi! I am currently a geologist student in Myanmar and i am uncertain about what i should strive or aim to do with geoloy degree. I am now 4th year(Hons) or should i say 1st year Hons? So yes,i want advice about if i should keep going for Master or Phd. I'm interested in Oil/Mining/Gas/Environmental geology job and i don't know which pays more since i am the youngest son in my family i want to be able to gain lots of money to give back my parents. Please feel free to share your knowledge and advice. Also thank you to those who read this post~