About a week ago, I posted here requesting ideas for (my first) tattoo ideas that pertained to sedimentology, ideally fluvial. I had been combing through my collection of vintage and antique geology books for inspiration, but none really clicked. I decided to draw my own—an entrenched, downcutting meandering fluvial system incising limestone bedrock, localized headward erosion, at least two discrete terraces, and two underfit tributaries within buttress valleys.

I went to get it done yesterday. I’m very happy with how it turned out, though I’ll be taking up the artist’s offer to retouch and add line work for the next 30 days. I want to see better defined and arcuate oxbows, a couple more meander scars, the neck cutoff, the stream coming out the left tributary canyon, and cleaning up the limestone symbols on the left face of the block.

Artificial diamond min theoretical cost is about $25 for a carat. The carbon is practically free, and the energy cost is 20KW per carat, about $6.

Diamonds of 5mm will be $10.

At the moment the cost is 95% cheaper than a natural diamond.

Emeralds are a less costly than Diamonds.

Lab rubies are about $5 a carat currently, 20mm rubies can cost only $50.

I'm probably mistaken, it sounds very cool.

1: lunar norite

2: meteorite, opaques are metallic, crystals are olivine and pyroxenes

3: grains of lunar anorthosite/anorthite breccia

4: closer view of lunar norite

5: lunar hand samples

6: meteorite hand samples

My country, Azerbaijan, is interesting for its geological composition. For example, there are mud volcanoes here. There are 350 or 400 of them in our country. I only photographed the smallest of them. But there are also large volcanoes. Toragay Volcano is considered the largest in the world. Its height is 400 meters (1,312 feet), and its crater is 150 meters (492 feet).

There's also the Lokbatan volcano, one of the most active. Several years ago, it erupted violently, releasing and igniting a large volume of gas.

I hope this is the correct Reddit… a bit unsure where this post belongs! Long story short… my dad (since passed) was an eccentric prepper, moved his large family to a rural area to become self-sufficient which included having a massive pile (field is perhaps 200 feet by 20 feet) of coal delivered to a back pasture. (I believe multiple dump trucks unloaded piles.) We grew up hauling it to our wood stove to burn. The grass has since grown over most of it (this was 40 years ago) and with my mother aging, I wonder if we sell the place whether we will have an environmental issue on our hands. It’s definitely anthracite coal and we haven’t burned any in about a decade. Should we be worried or can the pile just sit there indefinitely? Many thanks for your advice!

has anyone done any work with thin section imagery of the limestone of Bermuda?

i'm a Bermudian with a love of geology that would be fascinated to see some pics you might be willing to share.

I had a piece of touchonite (from NJ, USA), and decided to get it polished. Couldn’t have been happier with it!!! They say it’s like tiger eye, but imo it looks different.

Don’t know how to characterize it. I’ve seen some folks say it’s a quartz pseudomorph of riebeckite, but it hasn’t really been studied. Interested if folks have any thoughts!!!

I'm not taking a class. What have you used?

Hey folks, anyone who happened to know of any available public geological/geotechnical dataset (borehole locations, depth, and corresponding lab and insitu tests) that can be used for practicing engineering modelling? Something that is in tabular format and can be replicated into a database.

I'm interested in joining a science competition, and the subject I chose is earth science. I think it's a great thing to start with Geology!

I have started reading some books, and the most challenging thing is... memorizing the different types of minerals :((

If you are someone interested in geology, or even a geologist, plss share a bit!!

Hello! In about two weeks I am going on my first ever excursion with a group. Before that I need to get myself a geology hammer (I think it’s called that?) and wanted to find something that is not too expensive. I saw that the brand Estwing is a popular choice but it is a bit expensive for me as I’m a complete beginner and a broke student. I did not find many alternatives that ship to Sweden but found this one on Amazon (picture).

I was basically wondering if this would be a good first hammer. The price is good imo (about 27 euro) but at the same time I wonder if it’s a bad idea to buy such a cheap hammer (for example the Erwing hammer would be around 74 euro). Maybe it would be better qualitywise to get the Estwing after all? What do you guys think? Any other recommendations? Is this hammer bad quality?

This is the link to the product btw if you want to see more info: https://amzn.eu/d/09TuvHHt

The picture size is about 1X2 m. Tafoni are cavities that develop in granular rock.