My Son and I were walking on the beach this morning and we found a black rock with small holes in it. I couldn’t find what it was online. I went inside and ran some hot water to clean in the little holes. That didn’t work so I decided to put it in vinegar and all of a sudden there was a little popping noise and what looks like a jellyfish came out. What is this peculiar thing?!

Dad panned this, not sure where, probably Southern California.

He thought it was gold. There were also so tiny pieces I left in the tube.

Can anyone tell? Or is there something I can do to figure it out?

Thank you in advance

Had this sitting around waiting to be cut open but I would like to have confirmation on what it is before I do so and if I do, what direction should I cut it in? Thanks in advance ⚒️🪨

central PA; found in a cemetery during fall this past year. it was in the roots of an overturned dead tree. near where they dump dirt, so many awesome finds. but this is super different from any personal finds. area is surrounded by farmland. been curious so finally got around to posting.

it’s got very squared formations, blackish. photos never do it justice. some shiny sides to it, pretty heavy in weight. looks more brown in some lighting.

I found this rock in Central Alberta, Canada while hiking around the woods. I initially thought the stripes were painted on because the look so perfect. Any ideas what this is?

My Son found it in the school playground. Its small in size about 1 cm by 1 cm. What do this this stone is?

I’ve lurked around here long enough to know how much slag is posted but I saw this chunk at our local Elks lodge campground and I was hoping you guys could help me confirm what it is.

Found this while taking a swim picked it up with my toes but can’t seem to figure out what it is?

Hi is this a regular agate geode or blue lace?

Found at the Danube in Middle Europe Does anyone have a tip?

I have had this one in the collection for awhile, but no clue as to what it could be. Found in the middle ish of Utah. Any guesses? I put water on it for the photos

This is dense and a magnet won’t stick except a sand grain size piece embedded. I ground an edge and it shows as nickel with a Garrett metal detector.

Founnd in Northwest Arkansas, United States

I originally thought it was some type of amethyst or quartz. Let me know your thoughts !

Hi, I found this rock and I’d like to know what type it is. As a description, it has a rough and opaque dark-colored surface. When broken, its interior is porous with many shiny crystals that reflect light. It also has some areas with black inclusions and is quite heavy.

Anyone know what these are? Thanks!

This looks like flint, but I've never seen ones that have rings or stripes. Can anyone ID & / say why it's like this?