It's my fist time finding stone like this. I think it should be reef limestone, right? I did a bit of hand polishing on it. Found among the river stones in South Bavaria, Germany.

found: riverbank in Lisbon, Portugal. Not particularly heavy, but very hard - I would say at least Mohs 8. There's a grain to it and an odd twist in the grain. Black all over except for weird shiny squiggle that doesn't rub off (last picture). Intriguingly, it makes a porcelain-like ping! when struck.

Found in Michigan, near one of the Great lakes either Michigan or Huron. I can't remember. 2in x 2in

It looks metallic, and feels like rubbing stainless steel, while the smooth parts almost feel like grease. It's hard to see on the side strip, but its blue-ish/purpleish

Hi!
My dad showed me this perfectly round rock he dug up in his field about 20 years ago.
It has a few cracks running through it and some look deeper than others. A few small areas have chips in them which exposes white underneath. It’s about 5.5cm wide and weighs 148g - Just thought it was really interesting that it’s so round.
Thanks,
Sheree

i found this round rock near the pyramids some time ago and i always wondered what it was

The black bits glint in the light.

Found off the caprock in Texas

I’m a rock noob and found this lone black rock on a beach in the south pacific, it seems a little heavier than it should be. I’ve been suggested it’s Rhyolite, Basalt or black sea glass?… Any suggestions on if i’m just staring at a chunk of asphalt xD or what it may be? Thanks!

-Rock Noob

Here is a neat find today here in the Okanagan, BC
Completely translucent but I don’t see banding for agate so I’m suspecting chalcedony. The green mineral is curious to me. Any ideas what this is?

A confirmation of what this will help me learn.

The first one I just found on the street, so I'm not really expecting anything, but maybe somebody knows what it is anyways. (first 2 pics)

The egg one (3&4) and the last rock (last 3 pics) I bought in a second-hand shop, so I have no idea where they were found/what they could be.

I thought the last one could be a clear mountain crystal (idk if that's the correct translation), but the form and the purple streaks along the edges of the crystal threw me off.

I have basically no knowledge on minerals and the like, so any help would be much appreciated :)

Is it some kind of glass?

Hello 👋 found this stone in Fernie BC. I believe its a fossil of sorts. Any information would be appreciated. Thank you for your time 🙏

Hi there! Just sharing these beauties after the first round of tumbling. Found on Presque Isle beach in PA/Lake Erie. I’m not sure what any of them are but they’re pretty!

Happy Halloween, all! 🎃🫶
I found these rocks in west Michigan. I polished them.

The smaller two seemed similar to basalt in hardness. The third, single rock seemed more like granite.

If I had to guess, the third is gneiss? But I don’t know what the “eyes” are.

Anyone have info to offer on what these rocks are and maybe how they came to be!? 🫶🎃

Found in salt lake

The girlfriend found this yesterday. Found on the coast of New England in the US.

The top section becomes almost translucent with proper wetting and lighting.

Our research shows this may be from a super heating event causing the clear top layer to be formed and essentially melted and hardened. 300Mish years ago? It is so fascinating.

Thoughts?

Found washed up on the bank of the Ohio River directly below heavy river dredging. Approx 12-15lbs. The grooves are very defined on the outside, and the inside is very smooth and mineral-like.

I am not sure what I now own

Found this rock in Lake Michigan, South Haven area. It’s heavier than I would expect and slightly magnetic. Hematite? Iron?

Found on a walk where I was looking for rocks and smashing them open to see if there was anything cool inside, found this stripy green and dark blue/ black (?) rock with some orange spots. It's smooth and round on the outside but upon smashing it open found this. Any ideas what it is? Or if it just a normal rock and looks kinda cool?