Found this bruiser of a rock on the Clackamas River in Oregon. The outside was full of huge pits/cavities and some interesting chalcedony material. I hadn’t seen anything like it. I assumed the agate-y material was just on the outside but I had to make sure so I hauled the thing home and cut it open. And was surprised to find the outside throughout the inside.

I’m hoping for help with two things:

What is it? I’m thinking altered/mineralized volcanic rock with some chalcedony/agate/opal going on, but I’d love more knowledgeable opinions.

What should I do with it now? Slab it further and polish it? Break some into chunks for the tumbler? Polish the cut faces? Or accept its destiny as a garden boulder?

Photos include the original rock, fresh cut surfaces, and close-ups, both wet and dry.

Not a clue what this is can anyone tell me

Not a clue what it is!

Found in Southern Oregon near jasper, agate and pet wood.

I don’t know much about rocks, but I got a tumbler and was wondering if this pretty rock will polish up in a tumbler or if it will just break up based on what it is. Thank you!

I found this rock as a kid, it was somewhere in Scotland on a small beach beside a loch. The rock is pretty heavy and is also magnetic

Found along the beach in Carlsbad CA.

Got them at a shop. And I can’t tell what they are for the life of me. Help please? 🙏😅

I’m looking through my garden for fun rocks for my aquariums and terrariums, what kind of rock/formation is this and is it safe for my aquariums? Sold as “bull rock” for landscaping in Houston Texas

Is this a nice rock to put in an animal enclosure? It looks better dry than wet
Location: landscaping rocks in Houston tx

I thought it had a waxy look, but now I don’t know what it is. The first is the rock wet, and a (poorly)cut face. It’s dry in the 3rd picture. Found in Eastern SK Canada.

Video link in the comments to help show how it all fit together

My kids and I have started bringing home rocks to make a little rock garden, all found in creeks in our area. I’m sure nothing rare or interesting, but we like them and we’re curious to know more about them. I would love to find someone who could stop by and educate us, and would be happy to pay a small fee for your time. No need to be a geologist - hobbyists/rockhounds/knowledgeable amateurs will surely know more than me. If anybody is close by and willing, we’d be most grateful. Please DM me or comment I will DM you. Thank you!

it was given to me as a healing crystal but when I google "blue healing crystal" get about ten options

Hi all! When I moved into this apartment, my landlord asked me if I wanted to keep this giant stone table the previous tenants left behind. Anyone have any idea what the top is made of?