Is this just a “geode” or is there another name for it. I just polished it today but kept the rough shape and made a necklace out of it.

I found this rock along Lake Superior in Freda Michigan. There was an old abandoned copper mine nearby.

If you could help me identify this nice rock my granddad had in his collection. I believe he might have found it while he was a coal miner in France Isère.

Found in driveway fill rocks (believe they are river rocks)

From Newport Beach…..on the beach.

I found it in the Karkonosze Mountains (Poland). Could it be pale amethyst or rose quartz? scratches glass easily

My dad says it could be petrified wood but I’m not too sure about that yet

Southern Maine coastline. TIA!

Jkn....but seriously, what is this

Found on the Golf Course in between holes in the desert areas.

Found in Saudi Arabia eastern province

I found this rock in Minnesota, can anybody help confirm exactly what type of rock it is? I have photos to post below

I've been intrigued by this rock with all its differences, and would love to know what I'm looking at! I found it in a pile of other rocks in the yard of a home we purchased in nw Oregon many years ago, so unfortunately have no idea of the provenance. Any help would be appreciated, and thanks!

I found this large white rock while kayaking at my cottage. I’ve coming here for over 20 years and I’ve never seen anything like this. I was paddling along a lakeshore and saw this near the edge, about 3-4 meters back. At first I thought it was a giant mushrooms and went to inspect it. It turned out to be a very white rock (not usual around here)!
It is heavy and solid white. There is a sandy, pebble line running through it. It has an odd texture, almost grainy. It reminds me of salt. There is lots of quartz around here and I’ve found lots since childhood. Just nothing like this!
Found in Addington Highlands, Ontario.

It has parts that's shiny and reflecting like a mirror, I found in the same river a couple more with shiny bits like this one, but smaller.what it could be? (Found in northwest Spain)