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Can anyone identify this from my garden, please? WV3 area Wolverhampton. Heavy clay soil.
It is slag - waste from various industrial processes, such as smelting.
Thanks, Mike, a super speedy reply!
I'm fired up now with curiosity - would it be a coppery type of smelting to get the blue bands?
Also - is this slag still formed in modern-day factories/workshops and thrown as waste?
I'm assuming it is of recent fabrication and of no historic value?
That pale blue-green suggests either a cuprous (copper) salt or ferrous (as opposed to ferric) iron.
Yes, modern industries still produce this stuff. Some of it is used for making roads and paths, just as if it was rock.
It is difficult to say how old your piece is; some of it weathers quite slowly.
Other folks viewing here may have pertinent first-hand experience; if so, chip-in!
If you have a local museum, take it along and show it to them. There's a chance it might be related to local industry, perhaps of a kind that has since disappeared from the area.
Here's another example, somewhat like yours, discussed on NaturePlus a couple of years ago