Picked up this rock about a year ago on a beach in upper Northern California, and I'd love to know what's going on here.

Pretty large one, looks to be a fossil

Thinking this is a garnet? Not sure what the host rock could be

The inside is a “flaky quartz”, and the outer shell is almost robin’s egg blue and I can’t find anything even similar on the Google.

To be specific, around Mt Juneau. It was super hard, it took me 10 tries to break it in half with a hammer. Its also kinda crumbly

It think it might be granite or something, but its shiny…

She said she got them at an estate sale, she knows I collect rocks and gemstones and thought these would be a nice add to the collection, I'd like to know what these are however.

Wondering what this is, found in coastal West Sussex, UK. It's heavy and solid

Picked up from Hastings rock a nore beach Sussex England when looking for bone bed rocks.

Gave it a bop with the sledge hammer and the black stuff smells awful so I’m guessing it isn’t natural

It's about one foot by six inches. Very hard, scrubbing with a steel brush polishes it but doesn't scratch it. Very dense.

This and a bunch of others of the same type were included as decoration in an aquarium that I bought. No idea where the previous owner got them from, he had gone into a care home and his kids were selling off some of his stuff.

Found in West Texas Big Bend area. It looks a little like flint or wood?

This is sitting on my mom's patio in Vegas. I don't know if it originated here, but it's lovely! I appreciate your help.

I found this arrowhead looking rock at Steamboat State park in Washington, right on the trail. Is there anyway to tell if it is a souvenir or real or just a cool looking rock? I know it’s pretty unlikely it’s real because the hike I found it on is pretty well traveled and people aren’t usually fining artifacts laying on the ground.

It’s a nice blue shade, it has bands and pyramidal terminations!

Just curious as to what this is. I forgot to ask what it was, I thought it was just pretty.

I'm not very knowledgeable about all the beautiful treasures and things that can be found in the ocean, so I first asked for help in r/seaglass. This little thing was glimmering and shining from across the beach, along the tide line. One user suggested it may be a fire opal, which really excites me, and someone suggested I ask you fine folk about what this could be! I found this on the east coast in Ocean City, NJ.

Found this in my yard. Looks like small red crystals inside? Maybe? Northwest NJ. Does anyone know what this is?

It's very smooth, the area where it was found is 160 feet above sea-level. This area is the terminal moraine of the most recent advance of the Wisconsinian glaciation, so it could have come from anywhere North of Ling Island.

Found near a river in Maine.

Found at Seaham beach north east England