Dwayne Johnson
this post was submitted on 30 Dec 2025
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Cool Rocks
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A place for:
- Sharing cool rocks you found
- Discussing cool rocks
- Memeing about rocks
- Cool rocks
- Minerals are cool, too
Be gneiss to each other.
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You can have more than one favorite rock.
My favorite rocks are the ones that find me ๐
um, i have a piece of Mt. St. Helens on my mantle. I am not near Mt. St. Helens. It landed near my grandmother about 60 miles away from the eruption and she gave it to me.
i've been wanting to get a piece of manufactured bismuth crystal because pretty.
The best rocks have a story AND guess what I have bookmarked?
oh dude i have a rock collection that has to be seen in person. i have not figured out how to tell the stories in print yet because it's all sandstone and granite and superfund sites and black ops smuggling artifacts through bolivia in the dark of night mom told me not to talk about on the internet and shit.
that is an awesome link though. i will let you know how it goes
You can't say that shit and not post some cool rocks... but I understand if I already know too much.
my cellphone is in the other room. i will post one of my illegal rocks tomorrow
I love larimar. It's a subtype of pectolite unique to the Dominican Republic. Pectolite is usually gray or white but larimar picked up its distinctive blue coloration from the copper deposits and volcanic activity there. It looks like the bottom of a perfectly clean pool or the shallows of the carribean when the sun is shining through the water.
how do identify larimar? i have a beautiful stone that looks very similar to my untrained eye. it was a gift from a student
It should be that Carribean blue shade, but the color can vary in intensity. It might be mottled with lighter white spots. It usually has the distinct water ripple pattern but not always. If it's polished it will have a dense, smooth texture without any graininess, and maybe feel just a touch waxy.
It's pretty unique in color and patterning, so if a web search for larimar turns up pieces that look similar to yours it is, in all likelihood, larimar. It's a rare stone but not at all unreasonable to get a piece the size of a finger joint for under $50 depending on the grade. If a student gave you a piece, that was a nice gift :)
I have a small collection of minerals in my closet somewhere. A highschool was updating its science department and I was lucky enough to be working their processing for the summer and they let me keep the collection, since it couldn't be sent to anyone like the textbooks could, and would have likely been thrown in the trash. I know, how generous of them to let me keep their trash, but my thought process was "someone else might take them or I'd have to look through a dumpster otherwise"
My favorite rock would have to be whichever one was the last one I gave to my wife. Every so often I'll find a cool one and show her, and she usually insists on keeping them. She has a couple small (definitely not originally for weed) jars she's filling with them. Usually just rocks with quartz inclusions or cool sedimentary lines.
Probably Petoskey stone.
I discovered them while traveling through Michigan in the US and ever since they've been one of if not my favorite type of rock. There are some really beautiful polished examples out there, like this (not mine):
Great choice. One of my friends hunts for fossilized coral like that on Vancouver Island. Such a cool pattern.
I once found a river cobble that had so many chapters to its story. The reconstruction goes like this: Sedimentary (shale), + heat and pressure, metamorphosed into gneiss (precambrian). Fractured and intruded by hydrothermal fluids. Broken apart and tumbled into a river channel, buried and re-lithified into a conglomerate. Re-metamorphosed into a quartzite. Uplifted in a mountain chain, eroded out during Pleistocene, found by me on a terrace of river gravels like 10 yrs ago.
Well, that was a fucking beautiful description.
I found some shards of obsidian in my backyard rock border, so that's pretty cool
Gneiss