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Pink shale
Sept 20, 2015 9:10:49 GMT -5
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Post by cosmiccactus on Sept 20, 2015 9:10:49 GMT -5
Ok fellas here is one that has always puzzled me. Pink shale, seen all over the place from pit spoil heaps to roadways paths and building sites. What is it, why is it pink and why does it often look as though it's been burnt?
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Post by kundyhole on Sept 20, 2015 9:20:56 GMT -5
cosmiccactus
When you say pink shale do you mean red ash ?
If so if I recall it comes from pit tips !!
It is produced by spontainous combustion in the waste tips .
The waste contained a certain amount of fine coal and this had a tendencey to burn with limited oxygen in the waste mounds it would smoulder for years only bursting into flame if it was disturbed and normal amounts of oxygen where introduced , you could say red ash is the product of cooking a slag heap :-)
I think it is classed as a dangerous material these days .
Max
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Pink shale
Sept 20, 2015 10:05:33 GMT -5
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Post by cosmiccactus on Sept 20, 2015 10:05:33 GMT -5
Hiya max... I'm not sure if it's ash or not, some of the lumps are huge, measuring feet in length and thickness. I never saw any shale like this whilst working underground so I always thought it had weathered to this colour. I also assumed the heat was due to being buried at depth. I'm familiar with spontaneous combustion of waste tips and indeed underground as I spent six months hard stopping. I have found some really great fossils in this type of rock and the area of the tip I've dug it out from shows no sight of extreme heating so I'm not sure how this shale shows signs of being burn but other Rock next to it such as sand and silt stones do not. Very intriguing
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Post by John on Sept 20, 2015 11:58:57 GMT -5
Ok fellas here is one that has always puzzled me. Pink shale, seen all over the place from pit spoil heaps to roadways paths and building sites. What is it, why is it pink and why does it often look as though it's been burnt? |
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Pink shale
Sept 20, 2015 14:31:34 GMT -5
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Post by cosmiccactus on Sept 20, 2015 14:31:34 GMT -5
Cheers guys... So , in its natural I burnt state I assume it would be grey or black and perhaps softer and easier to split with s hammer and chisel?
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Pink shale
Sept 20, 2015 14:33:49 GMT -5
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Post by cosmiccactus on Sept 20, 2015 14:33:49 GMT -5
Sorry I meant unburnt state.. I'm sorry I'm on my phone and don't have me bins on hence the terrible spelling lol
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Post by tygwyn on Sept 20, 2015 15:24:55 GMT -5
Think Slag in an household fire,its often pink,
Same as some types of rock when burnt in a fire,again come out pink.
The Red Ash from many burnt Colliery tips have been used for many civil engineering projects,
1,000`s of ton`s were driven into Llanwern Steel Works from one of the Abertillery Collieries.
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Pink shale
Sept 21, 2015 4:44:41 GMT -5
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Post by cosmiccactus on Sept 21, 2015 4:44:41 GMT -5
Cheers for that guys. That clears that up. Because this shale has been burnt and altered it would probably be impossible to tell or guess which seam or level it came from then right?
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Post by dazbt on Sept 21, 2015 6:53:03 GMT -5
If the shale has fossils then experts are able to identify (relate to) the various seams, geological age etc. There is a stack of info on the net.
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Pink shale
Sept 21, 2015 10:04:52 GMT -5
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Post by cosmiccactus on Sept 21, 2015 10:04:52 GMT -5
Brill....cheers guys.
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Post by dazbt on Sept 21, 2015 10:21:54 GMT -5
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