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10-04-2018, 14:41   #1
Cul a cnoic
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Rock ID please.

Hi,

I have no idea as to what this rock is, a friend found it on his land which runs to the sea shore. It is about 2ft long and appears pitted \ erroded.

Any help in identifying it would be much appreciated.

Many thanks.


Image 1 here http://postimage.org/image/yg4luixrx/

image 2 here http://postimage.org/image/uwio4pncd/

Last edited by slowburner; 15-04-2018 at 09:01. Reason: bad link
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15-04-2018, 09:04   #2
slowburner
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If it feels comparatively light in weight, then it's probably a volcanic tuff
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04-12-2018, 19:12   #3
tabby aspreme
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Anyone know what this is , it looks like a big lump of tarmac, but it's not, most of the stones around here are granite
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05-12-2018, 10:59   #4
slowburner
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Quote:
Originally Posted by tabby aspreme View Post
Anyone know what this is , it looks like a big lump of tarmac, but it's not, most of the stones around here are granite
It's quite difficult to see from the photos but it looks to me a little like a 'smithing hearth cake' but I am not seeing the usual oxidised iron. Smithing hearth cakes were a by-product of medieval and post-medieval iron smelting furnaces. They are a conglomerate of waste, often heat affected stone (usually bog ore) cemented together with partially smelted iron.
Was it sitting on the surface or dug up recently?
Does it feel metallic?
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05-12-2018, 11:16   #5
tabby aspreme
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It was level with the surface, with a layer of grass covering it. I first pulled it up when ripping for forestry in 2010 and it's been there since, there is still clay on it so I cannot say if it feels metallic, but I will try a magnet on it, it would not be as heavy as a similar sized granite stone, it's approximately 60/45/30 cm.
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