I don't know if there are any geologists on here. I thought I'd give it a shot anyway. I found this a long time ago on eyemouth beach. It is an odd green/blue colour. It weighs 54g.
No identification made yet.
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What about weight - generally.
Could it be plastic? Lots is burned on beaches, forms a mass often multicolouted but sometimes mono.
Rolled in the sea for a while, looks like rock.
It does feel like rock. Very dense too. Heavy for the size it is.
you need to give us bit more info. How ''hard'' is it? Can you scratch with fingernail, copper penny or does it scratch glass.
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I've added a couple more photos. It can not be scratched with a nail or copper penny. Looks like it may be able to scratch glass slightly. It weighs 54g.
St.Abb's has volcanic outcrops and it is likely to be from here rather than the surrounding sedimentary rocks.
I did think it might be something to do with a volcano.
image one looks quite like a piece of granite. A sharper picture with the light source just above the camera might help
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Basalt is my bet and the blue green has leached from contained copper compounds reacting with seawater.
If you have a measuring jug you could use it to find its volume and knowing its weight work out the density. Otherwise try break a bit off using hammer to see an unweathered section and examine the crystaline structure.
basalt has small crystals and granite has much larger.
Have you looked at Olivine, granular masses. Metamorphosised limestone forms it. What kind of rocks are round by you? You say sedimentary, but if it's been up-chucked by St.Abbs old volcano... The transparent form is peridot, but I've seen the granular olivine before. Like the other's suggest; you may need to break it to find out, then a good viewing glass! Good Luck!
ps. I'm SO not a 'rock jock' just another OU student!
I've had a wee look at olivine. It doesn't really look like my stone. I don't really know what type of rock is around Eyemouth. I don't think I could bare to brake it open. I like my rock. I think it probably does have something to do with a volcano, since it's so near volcanic type areas.
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