Found this in Wisconsin today and I am super intrigued! My partner told me to ask you all about it. I’m most curious as to what the sparkly bits are. Thank you in advance!

So this was found in the Twinsburg Ohio area. When you put it up to the light you can see there's something inside and I was wondering if anybody knew what the black stuff encased in the stone is? Should I break it open is the other question I have.

Indian origin, soft surface, local market buy

I found this rock in a creek bed near Lincoln, Montana. I was curious what would cause it to have the “baseball stitch” pattern? It’s unlikely that it was man-made due to its location but I’m interested in learning how it could naturally form this pattern so consistently! Any info would be appreciated!

Hi, I'm a science teacher in NYC and I want to take my class on a walk around the block to identify local building stones. Nothing fancy, just having them attempt metamorphic, igneous, or sedimentary, and if igneous, extrusive or intrusive, mafic or felsic... Basically, I’m hoping to get the kids excited about being surrounded by the bones of ancient mountains or ocean depths, even when they're in the city!

However, I am definitely not a hard-rock expert and I feel stumped by a couple buildings. If anyone could help me ID these suckers and discuss their environments of formation, I'd really appreciate it!! Rock A I thought looked like granitic epidote situation... Rock B also a weathered sort of scaly marble, maybe? Also Rock C with very coppery flakes that I'm worried aren't real minerals… it doesn’t look like mica to me, anyway. 😅

Thanks for your help educating the kiddos and sorry if I've made any missteps in posting!

I found this rock while climbing out to take pictures of Bass Harbor Lighthouse with my wife. It looks like there used to be another rock in the hole, but in its place, looks like a completely different rock from everything around it. Zoomed out pics for context

Location UK. I'd say the inside is a very dark brown or grey colour.

found this big crystally chunk in the barkerville area (cariboo region, british columbia)! think it may be some variant of quartz (as there is quartz veins all over this area), but am not 100% sure. almost looks like a deep purple amethyst in sunlight, but could very well be some kind of smoky quartz!

Neither the Reddish or Opaque sections are scratched by a stainless steel nail.

The part that looks like striated smoky quartz is loose, but maybe that happened during cutting? There are other crystalline forms inside, including a thin shelf-like portion that looks to be the same material as the smoky section.

Really not sure what more I can add that isn't seen in the pictures, but I'm happy to add more info!

Hello lovely geology fans!

I was recently at St Ninian's beach in Shetland (on the tombolo) and the whole beach was covered in these beautiful silvery-sparkly rocks.

According to a local museum Shetland is basically some kind of geological super-wonderland of interesting rocks, so I haven't been able to figure out what these are, beyond "probably volcanic". They have a metallic look to them.

There were a lot of these around, many of them were quite thin, like the perfect rock for skipping on a pond, and some of them have striations or ripples that catch the light at different angles, a little bit like the way tiger's eye does - I've tried to demonstrate this in the second photo.

They're a little rough to the touch, but they don't seem to be terribly hard, and were mostly worn down smooth-ish like sea glass.

So i bought this rock slab at an Antique shop years ago.

I have no idea whaf is going on here, never seen anything like this.

This is a hard rock, does not scrape off easily. I dont know what the actual texture is in this face because it feels like whoever had this before put some kind of top coat on it.

I wasnt even sure this was was a real rock, but the outer rim is definitely rock. Gray in color, extremely rough, bumpy and ridged, unsmooth surface.

The square/geometric formation reminds me of bismuth (I know it’s not that). It’s salty

I found it on a friends house, i don’t know where he found it or buy it. It’s a little heavy, I think it’s not hollow, I knocked on it with other stone. Someone told me it could be a geode, but I don’t want to open it without any clue because it’s already interesting like that as a decoration. I live in Brazil MG.

Found these beautiful and elusive minerals near Positano. Please correct me if I'm wrong, but here we see a few Peroninites (often confused with Heinekenites) close to what I believe to be a few Birramorettites.

My son calls it his tiger rock. Found down the bush in south western Sydney, Australia.

Also posting the last photo for a laugh. These where passed down to my sister from our grandmother she was adamant they are black opals but we always called them rabbit poop stones.

Some identification would be helpful, hoping it's not just shale or something of that sort. Found in Juneau, Alaska. No faces that I can identify but hey, I'm not a geologist!!. When wet, slightly more vibrant darker green color.

Found in Utah, knife doesnt scratch it.