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Dry Gill Mine, Caldbeck Fells, Cumbria, UK
  
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Forrestblyth




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PostPosted: Mar 20, 2024 08:40    Post subject: Dry Gill Mine, Caldbeck Fells, Cumbria, UK  

One of my favorite locations and one of the best in the world for Campylite


20240320_132139.jpg
 Mineral: Mimetite (variety campylite)
 Locality:
Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom
 Description:
60 mm specimens average 3-5 mm crystals
 Viewed:  866 Time(s)

20240320_132139.jpg



20240320_132349.jpg
 Mineral: Mimetite (variety campylite)
 Locality:
Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom
 Dimensions: 60 mm matrix with 5mm crystals
 Description:
 Viewed:  872 Time(s)

20240320_132349.jpg



20240320_132359.jpg
 Mineral: Mimetite (variety campylite)
 Locality:
Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom
 Dimensions: 60 mm matrix with 5mm crystals
 Description:
 Viewed:  864 Time(s)

20240320_132359.jpg



20240320_132340.jpg
 Mineral: Mimetite (variety campylite)
 Locality:
Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom
 Dimensions: 60 mm matrix with 5mm crystals
 Description:
 Viewed:  867 Time(s)

20240320_132340.jpg



20240320_132327.jpg
 Mineral: Mimetite (variety campylite)
 Locality:
Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom
 Dimensions: 60 mm matrix with 5 mm crystals
 Description:
 Viewed:  867 Time(s)

20240320_132327.jpg



20240320_132219.jpg
 Mineral: Mimetite (variety campylite)
 Locality:
Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom
 Dimensions: 60 mm matrix with 5 mm crystals
 Description:
 Viewed:  866 Time(s)

20240320_132219.jpg



20240320_132310.jpg
 Mineral: Mimetite (variety campylite)
 Locality:
Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom
 Dimensions: 60 mm matrix with 5 mm crystals
 Description:
 Viewed:  867 Time(s)

20240320_132310.jpg


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Forrestblyth




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PostPosted: Mar 20, 2024 08:54    Post subject: Re: Dry Gill mine, Caldbeck Fells, Cumbria, UK  

Many other typical minerals of the ore field can be found associated with campylite


20240320_134653.jpg
 Mineral: Mimetite (variety campylite) with associated barite and zinc based crystals
 Locality:
Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom
 Description:
 Viewed:  858 Time(s)

20240320_134653.jpg



20240320_134607.jpg
 Mineral: Mimetite (variety campylite) with associated barite and zinc based crystals
 Locality:
Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom
 Dimensions: 60mm matrix 5mm crystals
 Description:
 Viewed:  854 Time(s)

20240320_134607.jpg



20240320_132219.jpg
 Mineral: Mimetite (variety campylite) with associated barite and zinc based crystals
 Locality:
Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom
 Dimensions: 60mm matrix 5mm crystals
 Description:
 Viewed:  855 Time(s)

20240320_132219.jpg


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Forrestblyth




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PostPosted: Mar 20, 2024 09:31    Post subject: Re: Dry Gill mine, Caldbeck Fells, Cumbria, UK  

This particular warm red coloration and barrel shaped crystal structure is very typical of the best specimens of this location. There are however may lime green specimens as would be normal in the Mimetite and Pyromorphite of which essentially are of all the same mineral but with additional elements that alter coloration and crystal form. A true Dry Gill campylite at its best are significantly red biased and armadillo or barrel-shaped rather than the hexagonal Mimetite habit.


20240320_135555.jpg
 Mineral: Mimetite (variety campylite)
 Locality:
Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom
 Dimensions: 5mm crystals
 Description:
 Viewed:  836 Time(s)

20240320_135555.jpg


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Forrestblyth




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PostPosted: Mar 20, 2024 09:35    Post subject: Re: Dry Gill mine, Caldbeck Fells, Cumbria, UK  

My favourite reddish hue and melon-shaped formation.


20240320_143224.jpg
 Mineral: Mimetite (variety campylite)
 Locality:
Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom
 Dimensions: 6mm
 Description:
 Viewed:  835 Time(s)

20240320_143224.jpg


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Forrestblyth




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PostPosted: Mar 20, 2024 09:40    Post subject: Re: Dry Gill mine, Caldbeck Fells, Cumbria, UK  

Both colors for are typical of this location.

This demonstrates the great variation in coloration of a particular mineral even from the same locality. I think the redness hue increases with increased arsenic concentration. I see the same thing with my Pyromorphite collection.



20240320_143642.jpg
 Mineral: Mimetite (variety campylite)
 Locality:
Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom
 Dimensions: 5mm crystals
 Description:
 Viewed:  835 Time(s)

20240320_143642.jpg


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Forrestblyth




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PostPosted: Mar 20, 2024 13:14    Post subject: Re: Dry Gill Mine, Calbeck Fells, Cumbria, UK  

I forgot until corrected that campylite is a variety of Mimetite. Another interesting fact is that chemically Mimetite is virtually the same as Pyromorphite. In fact, Mimetite is named so because it mimics Pyromorphite. I read somewhere it often takes chemical analysis to effectively differentiate between the lot of them. Lol
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Michael Shaw
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PostPosted: Mar 20, 2024 13:35    Post subject: Re: Dry Gill Mine, Caldbeck Fells, Cumbria, UK  

Forrestblyth wrote:
Another interesting fact is that chemically Mimetite is virtually the same as Pyromorphite.


Mimetite and Pyromorphite are similar chemically, but not virtually the same. One is an arsenate while the other is a phosphate.
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Forrestblyth




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PostPosted: Mar 20, 2024 14:06    Post subject: Re: Dry Gill Mine, Caldbeck Fells, Cumbria, UK  

Michael Shaw wrote:
Forrestblyth wrote:
Another interesting fact is that chemically Mimetite is virtually the same as Pyromorphite.


Mimetite and Pyromorphite are similar chemically, but not virtually the same. One is an arsenate while the other is a phosphate.


I stand corrected. My confusion came from misunderstanding an article in "Le- competior -Geologiquue"

The article stated Mimetite belongs to a group called the apatite group of minerals. I read it again and it stated that Mimetite is the arsenic pole of the Mimetite-Pyromorphite-Vandinite series.

I also saw a very interesting illustration somewhere of a triangular diagram explaining the link of the three minerals. I wish I could remember where I saw it as I would love to reread it to try to educate myself on the chemistry.

Either way in the Caldbeck Fells area a lot of Mimetite and Pyromorphite specimens visually look identical to me lol. They are both my favourite minerals, and I would love to know more about them.

It must have confused a lot of ancient Greeks lol as it gets its name from mimetes (imitator).


I found the illustrations on mindat, article by Matt McGill. Very interesting read
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