Calling geoman

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coal digger
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Calling geoman

Post by coal digger »

Had a flick round on some land which has had a deep plough going past the sandstone and into the clay which is a first for me. I thought this was pottery at first the way it was gleaming but turns out it's rock. I have flatted one side off and polished it just out of curiosity. Any idea which of the three rock formations it could be? Found in Derbyshire.
Cheers cd.
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Re: Calling geoman

Post by ratty »

Possibly furnace slag. :)

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Re: Calling geoman

Post by ratty »

Blue John has more of an transparent crystal structure,similar to amethyst. :)

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Re: Calling geoman

Post by sweepstick47 »

Not entirely sure but the 2nd photo has a good degree of 'blue' to it so it could possibly be
Blue John which is indigenous to Derbyshire (West-end of Hope valley). We have some knowledgeable geologist types on the forum so hopefully a definitive answer will arrive shortly. Good Luck - Regards ss47 ::g
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Re: Calling geoman

Post by geoman »

Thanks for the prompt. It is likely to be blast furnace slag which is a vitrified glass in effect and often of this bluish to greenish colour.

It will have come from the furnaces of Sheffield as a soil conditioner for the land. The material contains phosphorus and other minerals which promote plant growth so was used before modern fertilizers.

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Re: Calling geoman

Post by coal digger »

geoman wrote:
Wed Mar 18, 2020 9:10 pm
Thanks for the prompt. It is likely to be blast furnace slag which is a vitrified glass in effect and often of this bluish to greenish colour.

It will have come from the furnaces of Sheffield as a soil conditioner for the land. The material contains phosphorus and other minerals which promote plant growth so was used before modern fertilizers.
Brilliant geoman,makes perfect sense .Thanks for your time and knowledge,cd ::g
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Re: Calling geoman

Post by geoman »

Happy to oblige.

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