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Silurian greywackes on the Berwickshire coast Scotland
  
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Forrestblyth




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PostPosted: Nov 16, 2022 09:10    Post subject: Silurian greywackes on the Berwickshire coast Scotland  

In macro the Silurian greywackes are about as interesting as cement! But in pano they are magnificent. From Eyemouth to Siccar point the geology is stunning.

It is no wonder Hutton looked at these formations in the 1700s and challenged that these had to be laid down over millennia rather biblical time frames.

There is plenty of information on the mudstone and greywackes of this area but I have never found what the pinkish crystalline veins are that can often be seen running through the strata I have chipped a few chunks of this crystalline material to try to see what it is. If any one knows please let me know.



20220818_142328.jpg
 Mineral: silurian greywack
 Locality:
Berwickshire Scotland
 Dimensions: 500cm to 5 meters thick
 Description:
 Viewed:  651 Time(s)

20220818_142328.jpg



20220818_141558.jpg
 Mineral: Silurian greywackes
 Locality:
Berwickshire Scotland
 Dimensions: 500cm to 5 meters thick
 Description:
 Viewed:  651 Time(s)

20220818_141558.jpg



20220818_141318.jpg
 Mineral: Silurian greywackes
 Locality:
Berwickshire Scotland
 Dimensions: 500cm to 5 meters thick
 Description:
 Viewed:  651 Time(s)

20220818_141318.jpg



20220818_141207.jpg
 Mineral: Silurian greywackes
 Locality:
Berwickshire Scotland
 Dimensions: 500cm to 5 meters thick
 Description:
 Viewed:  651 Time(s)

20220818_141207.jpg



20220818_141157.jpg
 Mineral: Silurian greywackes
 Locality:
Berwickshire Scotland
 Dimensions: 500cm to 5 meters thick
 Description:
 Viewed:  651 Time(s)

20220818_141157.jpg



20220818_140412.jpg
 Mineral: Unknown vein
 Locality:
Berwickshire Scotland
 Dimensions: 70cm x 70cmm
 Description:
 Viewed:  653 Time(s)

20220818_140412.jpg



20170625_111707.jpg
 Mineral: Silurian greywackes
 Locality:
Berwickshire Scotland
 Dimensions: 500cm to 5 meters thick
 Description:
 Viewed:  651 Time(s)

20170625_111707.jpg


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Kevin Schofield




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PostPosted: Nov 16, 2022 10:32    Post subject: Re: Silurian greywackes on the Berwickshire coast Scotland  

Forrestblyth wrote:
In macro the Silurian greywackes are about as interesting as cement! But in pano they are magnificent. From Eyemouth to Siccar point the geology is stunning.

It is no wonder Hutton looked at these formations in the 1700s and challenged that these had to be laid down over millennia rather biblical time frames.

There is plenty of information on the mudstone and greywackes of this area but I have never found what the pinkish crystalline veins are that can often be seen running through the strata I have chipped a few chunks of this crystalline material to try to see what it is. If any one knows please let me know.


As it is clearly harder-weathering than the greywacke (not a word we hear often these days!) matrix, I'm thinking that it is likely to be quartz, stained pink by a little iron.

Simple hardness test should confirm...

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Forrestblyth




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PostPosted: Nov 16, 2022 13:38    Post subject: Re: Silurian greywackes on the Berwickshire coast Scotland  

Its not as hard as quartz.

I sometimes find it with the odd vein of creamy white calcite ? next to it. i will try to find a photo of it. This might even be the same material in a larger form ?



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 Description:
 Viewed:  590 Time(s)

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 Description:
 Viewed:  589 Time(s)

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Bob Carnein




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PostPosted: Nov 16, 2022 16:32    Post subject: Re: Silurian greywackes on the Berwickshire coast Scotland  

It appears to have rhombohedral cleavage, which suggests calcite. Is the host rock metamorphic?
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Forrestblyth




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PostPosted: Nov 16, 2022 16:48    Post subject: Re: Silurian greywackes on the Berwickshire coast Scotland  

Bob Carnein wrote:
It appears to have rhombohedral cleavage, which suggests calcite. Is the host rock metamorphic?


It is sedimentary but is classed as borderline metamorphic.There are also loads of volcanic rock adjacent. Andesite lava flows around a lot of these formations. Geologically, it's a very diverse area
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Forrestblyth




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PostPosted: Nov 16, 2022 17:08    Post subject: Re: Silurian greywackes on the Berwickshire coast Scotland  

This is some of the interesting Andesite lava flow that push up through the greywackes. You can easily still see the sticky flow folds in the material. I sometimes see a small amount of the vein in this material as well.


20221006_140552.jpg
 Mineral: andesite
 Locality:
st Abbs
 Dimensions: 1 meter
 Description:
 Viewed:  547 Time(s)

20221006_140552.jpg



20221006_140548.jpg
 Mineral: Andesite
 Locality:
St Abbs Berwickshire
 Dimensions: 1 meter
 Description:
 Viewed:  547 Time(s)

20221006_140548.jpg


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Forrestblyth




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PostPosted: Nov 16, 2022 17:26    Post subject: Re: Silurian greywackes on the Berwickshire coast Scotland  

This is some information from a paper on this area. i don't understand a lot of it lol but it may give a hint to the unknown material.

The lavas of St Abb's Head are generally andesitic, but the constituent minerals are so altered that classification is often in doubt. In thin section the feldspars appear, when fresh, to be mainly oligoclase or andesine, and the ferromagnesians, usually altered to iron-ore, may show the crystal form of hornblende or augite. More basic rock, with labradorite and olivine, is quite common. Micas, particularly biotite, are often present and in somerocks are abundant. The rocks are generally microporphyritic, and under the microscope many show well developed flow-structure. The upper and lower parts of the flows are often highly amygdaloidal, the vesicles being filled with silica and/or calcite

By D.C.Greig. From Scottish Borders geology: an excursion guide edited by A.D. McAdam, E.N.K. Clarkson, P. Stone. Edinburgh : Scottish Academic Press (for Edinburgh Geological Society), 1972.
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Bob Carnein




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PostPosted: Nov 16, 2022 19:37    Post subject: Re: Silurian greywackes on the Berwickshire coast Scotland  

I would recommend that you test the pink material. See whether it scratches a copper coin and/or glass; powder a small amount and place it in hot vinegar to see whether it "fizzes". The presence of calcite and quartz in the volcanic amygdules suggests that either may also be present in the fracture-fillings in the metagraywacke.
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James Catmur
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PostPosted: Nov 17, 2022 06:32    Post subject: Re: Silurian greywackes on the Berwickshire coast Scotland  

A bit further north in Fife the veins are Baryte, Calcite and Dolomite. Celestine has been reported but I have never found the locality. They also seem to be associated with the local volcanic activity
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