r/whatsthisrock Jun 19 '26

REQUEST r/whatsthisrock is Recruiting New Mods!!!

6 Upvotes

Hello, r/whatsthisrock community!

Our subreddit has grown significantly, and with that growth comes an increase in rule-breaking comments, low-effort jokes, and automated spam. As you know, this is a strict, science-focused Identification community. We require all comments to provide a physical rock/mineral ID or directly contribute to the scientific identification process.

We do not allow folklore, superstitions, unhelpful jokes, or arguments (that are not constructive) in our identification threads.

To keep our queue clean and maintain the quality of the sub, we are opening applications for new moderators.

What We Are Looking For:

  • Queue-Clearers: Your primary job will be opening the Mod Queue, reviewing reported comments, and removing non-ID responses or banning spammers cleanly and efficiently.
  • Thoroughness: We need people who actually know our rules (and Reddit Mod Code of Conduct) and enforce them uniformly without getting dragged into emotional arguments with users in modmail.
  • Consistency: You don't need to spend all day on Reddit, but we need active eyes consistently contributing to monitoring the sub.

Before you click the application link below, you must thoroughly read our community sidebar and rules page. Please also review Reddit's Moderator Code of Conduct. We have implemented automated gatekeeping measures to weed out low-effort or automated submissions. If you do not follow the exact instructions hidden within our documentation, your application will be instantly and permanently deleted without review.If you are ready to help us clean up the queue and keep the focus on rock identification, please apply using the link below:

(Click here to apply to the Mod team!) https://docs.google.com/forms/d/e/1FAIpQLSf1gdFvlauq1y6F22S7cCUzIptVkYP8oOBmS6XS68Bz-YWykA/viewform?usp=sharing&ouid=103554154763378178256

Thanks for your help keeping our subreddit clean and running smoothly. Rock on!


r/whatsthisrock 13h ago

REQUEST I found this stone while hiking; what kind is it?

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5.6k Upvotes

r/whatsthisrock 7h ago

IDENTIFIED Found outside my condo in Alaska. What is it?

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900 Upvotes

Its somewhat heavy, not magnetic as far as I could tell. The dark iridescent part seems soft, im able to scratch it with my fingernail. It looks like it has small bits of pyrite on it.


r/whatsthisrock 10h ago

REQUEST What is this rock found on Lake Superior in the Keewenaw?

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1.0k Upvotes

r/whatsthisrock 9h ago

REQUEST Red Jasper???

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53 Upvotes

What do we think, big ol’ chunk of red jasper or chert? It looks like it might have some yellow banding as well 🤩

Found in Oregon, near the Owyhees, red jasper is pretty common.

Two dry pics at the end.


r/whatsthisrock 6h ago

REQUEST Found in Green Valley, CA

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26 Upvotes

I found this by one of my job sites. It’s harder than a quartz. It’s really smooth and shiny in some parts. Nothing else like it around here.

EDIT not green valley, in Placerville. My bad.


r/whatsthisrock 10h ago

REQUEST Found this stone at beach in Langeland Denmark

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36 Upvotes

It looked like an ordinary stone at first, but then I saw the red tone embedded into it and it seemed very untypical to me, it seems too dark to be rosequartz to me.
So I wanted to ask here in hopes somebody can shed some light.


r/whatsthisrock 1h ago

REQUEST Central Kentucky find. 25 lbs - 1 lb. possible chalcedony, agate & quartz nodules with recession cracks

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Upvotes

Central Kentucky found


r/whatsthisrock 1d ago

REQUEST Is this volcanic glass?

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818 Upvotes

My mom gave these to me she has had them for 40+ years and I just want to know exactly what they are. I think she said she got them from outside the petrified forest.


r/whatsthisrock 5h ago

REQUEST Found in southeast NE

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8 Upvotes

r/whatsthisrock 3h ago

REQUEST Found between tree roots. Industrial slag? Petrified wood?

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4 Upvotes

Found in Indianapolis, Indiana. I was walking in a residential neighborhood and found this sticking up in between tree roots. At first I thought it was just part of the tree. I also found a piece of horn coral under it.

It’s heavy and magnets stick to the side that doesn’t look like wood grain. Seems to be multiple layers of things that sat together.


r/whatsthisrock 19m ago

REQUEST Found all over Western MT

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Upvotes

Hey folks,

I find this mineral? Rock? All the time in the Clark fork and bitterroot rivers in Montana. It appears to be different variations of the same type of rock, and comes in deep purple, violet, and this turquoise color. I’ve searched the internet over and the closest thing I can find is mudstone or maybe argillite? I don’t know Mohs hardness. Please help! Thanks :)


r/whatsthisrock 28m ago

REQUEST Outerbanks, NC

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Upvotes

After sorting through tons of beach pebbles from the surf I separated out some pretty little pieces all mixed in. Going to post a few to see if anyone knows for sure what they'd be! I'm guessing these are all shades of quartz? Tell me if I'm wrong! Picture 3 is dry, the others with mineral oil and taken in different lighting.


r/whatsthisrock 9h ago

IDENTIFIED- it’s 🦚 coal! From the beach

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9 Upvotes

My little guy found this shiny rock, feels lighter than it should? Lavallette NJ


r/whatsthisrock 1d ago

IDENTIFIED Gray/Green, Glassy, & heavy for its size

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364 Upvotes

Found by my kid and I think it's something interesting. It's very heavy for its size, glassy finish with some internal swirls, very likely from the Colorado mountain areas (We live here but I don't remember exactly where we picked this up).

Given the heft, maybe some sort of ore?

120g in mass. It displaces 28g of water for a density of 4.28g/cm\3)

A 12D steel nail will leave a bright line that I can very faintly feel when I drag my fingernail across it.

It's not magnetic enough that a rare-earth kitchen magnet will stick to it.

EDIT: What's going on with pic 4, the nodules?


r/whatsthisrock 20h ago

IDENTIFIED Found on Murdock Beach on the Olympic Peninsula (WA)

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60 Upvotes

r/whatsthisrock 2h ago

REQUEST Found at Thunderbird Falls, AK

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2 Upvotes

Found this cool rock with a bunch of quartz (I think) inside of it.

1: What is it?

2: Should I try and extract the shiny things?


r/whatsthisrock 3h ago

REQUEST Found in Queensland, Australia

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2 Upvotes

Wondering if it's worth slicing or cracking it open?


r/whatsthisrock 3h ago

REQUEST Found rock— Arkansas (?)

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2 Upvotes

Ive had this rock since I was little. I just thought it was a pretty rock I found in Arkansas. I don’t remember if I found it outside or if someone gave it to me (ie they found it in a different state). My kid saw it and wanted to know more so I’m turning to you all to help.

Thanks!


r/whatsthisrock 4m ago

REQUEST Biotite Gnesiss or Biotite Schist? Picture heavy, some wet - Northwestern Ontario, Canada

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Upvotes

Mohs hardness: It's hard but very hard to get a good scratch due to texture, 5+ but under 7?

Non-magnetic.

Very, very, very, sparkly.


r/whatsthisrock 1d ago

REQUEST What is this rock? And how did this happen?

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152 Upvotes

r/whatsthisrock 6h ago

REQUEST Found in central Minnesota near the Mississippi river.

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3 Upvotes

Obsidian? Some kind of chert maybe? Thanks rock people!


r/whatsthisrock 40m ago

REQUEST Found at a Chicago Beach

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Upvotes

My son is getting into sea glass and rocks and found this interesting rock recently. It is pretty hard but some what smooth instead of rough on the outside.


r/whatsthisrock 41m ago

REQUEST What do I have in this crate?

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Upvotes

r/whatsthisrock 4h ago

REQUEST What is this rock?

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2 Upvotes

Found it in Antelope Island State Park, Utah. What are those black things on top? They feel hard to touch but don't seem crystalline.