Geological Pics - Post any interesting photo here

53989108420_4e5f325c8e_k.jpgso this is a photo I took last summer in an old quarry near Mylor Creek in Cornwall, I have been wondering for some time as to what it maybe.
I don’t know if it’s obvious, but it’s a mineral vein running over base rocks.
I suppose the obvious question is, why were they quarrying here? Were they looking for this mineral or was it that they wanted the rock and we’re discarding the minerals?
If it’s any help the grid ref of the quarry is: SW 812 357
 
Yorkshire Lad said:
View attachment 1643so this is a photo I took last summer in an old quarry near Mylor Creek in Cornwall, I have been wondering for some time as to what it maybe.
I don’t know if it’s obvious, but it’s a mineral vein running over base rocks.
I suppose the obvious question is, why were they quarrying here? Were they looking for this mineral or was it that they wanted the rock and we’re discarding the minerals?
If it’s any help the grid ref of the quarry is: SW 812 357
Click to expand...
Have you checked on the BGS website ?
 
The quarry is in the Porthleven Breccia Member of Devonian Age. God knows what they'd be quarrying from that. I'm not convinced that's a vein per se, but it certainly looks like a bit of a crush zone or fault. We need someone with a bit more rock info on this one!
 
BertyBasset said:
The quarry is in the Porthleven Breccia Member of Devonian Age. God knows what they'd be quarrying from that. I'm not convinced that's a vein per se, but it certainly looks like a bit of a crush zone or fault. We need someone with a bit more rock info on this one!
Click to expand...
Here’s another photo from the same location, again strange geological occurrence 53988994869_91184488f9_k.jpg
 
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