Any idea what kind it is?
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That is a very cool rock!
I thought so!
I think it’s some kind of (maybe hydrothermally altered) sandstone.
That vein is quartz, i’m pretty sure. Does the rest have a slightly grainy texture or is it smooth?
It’s fairly smooth. I agree the vein is quartz.
I think it might be petrified wood
I don’t know. Petrified wood isn’t all that common. Why do you think it’s that?
To me it looks like a finegrained, silicious, sedimentary rock. Might be slightly hydrothermally altered or metamorphosed, can’t really tell from the photos.
That’s not to take away from the coolness of the rock though. It absolutely is a cool rock. I absolutely adore that quartz vein.
Nah bruh that’s cow shit. Why you put cow shit on the table? /j
I asked chat gpt because I was curious…
The rock appears to be iron-stained sedimentary rock, most likely:
Sandstone or siltstone
Reasons:
Brown/yellow coloration typical of iron oxide (limonite/goethite) staining
Visible layering and flaking, suggesting sedimentary bedding
Fine-grained surface (no large visible crystals)
Breaks along planes rather than showing crystalline fracture
The reddish area
The darker red patch may be:
A small iron-rich concretion
Or possibly a fragment of jasper (iron-rich microcrystalline quartz) embedded in the host rock
Less likely options
Not granite (no visible interlocking crystals)
Not basalt (wrong color and texture)
Not metamorphic schist (no clear foliation or mica sheen)
If found in Scandinavia, this type of iron-stained sandstone/siltstone is common in sedimentary formations and glacial transport deposits.
For more certainty:
Check if it scratches glass (quartz-rich sandstone will)
Drop vinegar on it (if it fizzes, it contains calcite → limestone component)
Note where it was found (coastal, inland, quarry, etc.)
Most probable identification: Iron-rich sandstone or siltstone.
That’s interesting. I’ll have to do some tests. Thank you!
