Rock or slag? Not magnetic, doesn't scratch easily like aluminum might.

SW Utah - shell fossil? Glassy sound when dropped. Thanks!

I think they’re so pretty but I’d love to know what it is!! One of them appears to be fully made of the pink sparkly stuff.

Found on beaches in North East England 🌊🇬🇧

I think part of it’s at least quartz and Rylo light

Does anyone know what it is please?

The small crystals are yellowish and light does pass through them.

It's crystal like. I was going to put it in an untrasonic but I decided it would be smart to first ask for information.

I found this near Selah, Washington. Would you refer to this as a common banded agate or something else? Reference with my wife’s hand for size.

Sorry for any glare. We got it wet to better show some of the colors and banding.

Properly cleaned, soaked & air dried by a window. Found during low tide near deep tide pools. Appreciate any input. Thank you 🙏🏼

Hi! How is it going everyone? I found this a few months ago in NYC and kinda forgot about it, when I'm looking at it today again I noticed it's inside a Jacob & Co jewelry bag, so someone took care of it, not sure what it is, feels silky smooth with the texture of a normal rock in some places, any ideas as what it could possibly be? Thanks for your time in advance and sorry for the inconvenience

I thought it was fluorite it is not UV reactive. Came with a bunch of auction items so no idea of origin.

Any clue to what this is ???

Going through my old collection. Found somewhere is US.

Checked out a new (to me) creek near my home and found these interesting formations. Looks like quartz in some kind of matrix but I’ve never seen this spiderweb like version before. Plus the foot-long one is an odd shape. Any thoughts?

Found on beach (North sea, England) and I'm genuinely curious what it is and if its at all dangerous. :)

Found this walking the beach at sunrise last fall after a hurricane. There are tiny gold flecks that can be seen in the light.

My best guess is this is some sort of pseudomorph of a mineral after tourmaline, however the more I look at it the more i'm confused. This was found in southern california, its a black appearing tourmaline but it was actually an extremely dark red when shining light on the cracked parts, and the crystal is growing straight through the center, was once fully surrounded by the tourmaline like a watermelon tourmaline, I was suggested maybe aquamarine, Achroite(colorless tourmaline), or clear Lipidolite, Any better suggestions?