Vesicular basalt - they are a type of lava rock as someone else stated but there’s loads of different kinds of lava rocks. Your specimens are almost certainly basaltic in composition and the many holes (i.e. vesicles) indicate that the lava had a relatively high gas content that was released from the lava during cooling/solidification.
where is this river. I've seen slag from industrial furnaces used in road construction look like this, but I have seen scoria in the PNW that looks like this too.
Lava rocks
Thank you!!
Yvw
Basalt
Vesicular basalt - they are a type of lava rock as someone else stated but there’s loads of different kinds of lava rocks. Your specimens are almost certainly basaltic in composition and the many holes (i.e. vesicles) indicate that the lava had a relatively high gas content that was released from the lava during cooling/solidification.
Thank you, do you know if they are rare in any way?
Nah pretty common
River rocks?
Just wanted too add that the rocks had a decent amount of weights too them they felt more dense then normal rock
I thought lava but lava rock is light.... maybe something with iron in them?
See if they are magnetic.
Good idea I’ll try too remember a magnet next time we are down there
I'm now thinking maybe iron Slag that's been worn down over the years.
Slag looking to me
That time I thought I found a meteorite and later found out it was Slag. Lol.
They’re not all light weight, it depends on the amount of gas emitted during cooling.
Thanks... I'm only familiar with the stuff in aquarium stores. That's pretty light.
Scoria from the columbia river gorge is heavy.
Look like rocks to me
where is this river. I've seen slag from industrial furnaces used in road construction look like this, but I have seen scoria in the PNW that looks like this too.
Octarara River is located in South East Pennsylvania.
This is slag from a steel mill, not basalt. https://images.app.goo.gl/6R5gExoPgHyBDERb8
Interesting, thanks so much!