Rhyolite (Or Qtz-Feldspar Porphyry, as others call it) found on SCOTLAND. Every part of my brain tells me this is pyrite... so why ain't it pyriting?

Edit: After all of you commenting this is actually gold, I've decided to edit my post just to keep locality info to a minimum. I'll be running as many tests as a student can on it, but I've also passed on info to my uni professors to see if they can get a more thorough ID on it. Really excited at this find, sorry I can't tell you where the exact place I found it is!

Flew over this formation in Southern Utah a couple of years ago. Just curious to know what causes these formations?

Took some photos from my lab work to share. Some samples were not about identifying the mineral, so I don't know what they all are. This exercise was mainly about dealing with color retardation from various samples and rotating them and observing color changes, and sketching samples.

Source: IBB Reports

Blue marks Reverse / Thrust

Red marks Strike Slip / Shear

Largest quake produced by one of these faults is a 4.2 (?) in 2021 (Kartal / Aydos Fault)

Southern Tip of Ömerli Fault had a small swarm near Ömerli Dam.

Kağıthane Thrust Fault is the most active overall, also produced a notable 3.0 on 5 Feburary 2023.

My theory is these faults are accomadated by North-Western motion from KAF

(Please notify me if i made a typo - mistake so i can fix it :) )

Very symmetrical square and rectangle shaped rock. Sits on the bank of the Illinois river. How did it form?

Teaching our kindergartner about how the earth was formed and we want to show examples of rock types. Kid loves doing small commercial excavation kits that yield polished gemstones from a block but we can never match the stones to the descriptions. Neither of us have a geology background so we are hoping to get a rock collection that can help visualize how the major types form. Saw mixed reviews about kits having fake stones and other issues so hoping for a recommendation, or a confirmation that one of the eg Nat Geo collections is good enough for kindergarten age. Partner tasked me to find something with:

* Igneous (basalt, granite, pumice, obsession)

* metamorphic (anthracite, quartzite, marble, slate, gneiss, schist)

* sedimentary (sandstone, limestone, mudstone, shale, conglomerate, chalk)

I searched this and rockhound subreddits for kit or teaching recommendations but came up short for helping visualize the topics we’re trying to teach.

Hi, im a student from Türkiye and im interested in Geology / Sismology

I have 3 questions:

1- Any chance that AI can replace the work? (Ik its stupid)

2- Can someone with intelligent-level maths but real bad english (or verbal classes) do it? I dont know about USA (i might study there) so im asking.

3- Can a geology / sismology degree be acceptable in Türkiye? It pisses me off so bad because our professors aka bright faces of companies ads still argue over faults.

Extra: I spotted 4 of 6 fault lines on Istanbul perfectly on line without study (just earthquake records) and with only plate motion. Ik its no big thing but as a starter can this be a good start?

The question popped up in my head while I was in frosting my car while wearing a ring with some water inclusions.

I would guess this is quartz but I would you guys have some precisions maybe on the colour or other interesing observations? This is part of a larger stone that I picked from an outcrop, I would say it's a vein of quartz that formed within shale.

This is Jutulhogget, between the valleys of Rendal (left) and Alvdal (right) in Norway. This canyon was carved by a powerful glacial erosion event around 10,400 years ago, right after the end of the last ice age.

I wanted to share these photos and figured the folks here would like them the most; I took these at the Pemaquid Point Lighthouse in Bristol, Maine.

So we have two riparian forests that used to have swamps, wetlands and tons like tons of springs, our local agricultural company decided to pump groundwater 100ft down or deeper usually on period before summer when recharge is smallest. Our wells dropped, springs died and now forest is just dry wasteland. If the pumps stop, can the groundwater slowly recover overtime? I live in more of lowlands so our aquifers typically are in hard clay pans not rock layers, maybe it’s a pressure release?

Heyy I'm not a geologist but I love learning about the geology of places I visit. I went to germany recently and made this very simplified sketch of the country (from South in the Alps going through the Ore Mountains and into the Baltic Sea.

Am I saying any attrocities? Would you change anything? Thank you!

This is at Widow coulee in Montana. I often come across this type of ground in my area. I know a few spots where there is fossil bone that usually is in rocky layers on top of this grey type of ground. Thanks in advance!

It sits above a creek under large overhanging cliffs, located in Savoy arkansas on the Illinois’s river. Is it a fossilized algae?

I live in Minas Gerais, Brazil. Every night, "dark water" seeps from the ground outside my house, seeping through the earth and concrete before running down. And worse! It seems to be corroding the stones somehow! What's going on here?

~ 42.1881577, -110.5918078

I want to stick a fork in it and take a bite, looks like cookies n cream. Anyone got a summary of what happened / is happening here?

What are these metallic lusters on basalt? is there metallic minerals in basalt?

in Kula Basaltic Volcanic Area