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Forrestblyth
Joined: 21 Jun 2022
Posts: 56
Location: Ne244ly
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Posted: Mar 20, 2024 08:40 Post subject: Dry Gill Mine, Caldbeck Fells, Cumbria, UK |
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One of my favorite locations and one of the best in the world for Campylite
Mineral: | Mimetite (variety campylite) |
Locality: | Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom | |
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Description: |
60 mm specimens average 3-5 mm crystals |
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4104 Time(s) |
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Mineral: | Mimetite (variety campylite) |
Locality: | Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom | |
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Dimensions: | 60 mm matrix with 5mm crystals |
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4119 Time(s) |
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Mineral: | Mimetite (variety campylite) |
Locality: | Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom | |
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Dimensions: | 60 mm matrix with 5mm crystals |
Description: |
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4121 Time(s) |
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Mineral: | Mimetite (variety campylite) |
Locality: | Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom | |
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Dimensions: | 60 mm matrix with 5mm crystals |
Description: |
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4130 Time(s) |
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Mineral: | Mimetite (variety campylite) |
Locality: | Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom | |
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Dimensions: | 60 mm matrix with 5 mm crystals |
Description: |
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4111 Time(s) |
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Mineral: | Mimetite (variety campylite) |
Locality: | Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom | |
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Dimensions: | 60 mm matrix with 5 mm crystals |
Description: |
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4110 Time(s) |
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Mineral: | Mimetite (variety campylite) |
Locality: | Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom | |
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Dimensions: | 60 mm matrix with 5 mm crystals |
Description: |
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Viewed: |
4104 Time(s) |
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Forrestblyth
Joined: 21 Jun 2022
Posts: 56
Location: Ne244ly
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Posted: Mar 20, 2024 08:54 Post subject: Re: Dry Gill mine, Caldbeck Fells, Cumbria, UK |
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Many other typical minerals of the ore field can be found associated with campylite
Mineral: | Mimetite (variety campylite) with associated barite and zinc based crystals |
Locality: | Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom | |
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Description: |
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4100 Time(s) |
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Mineral: | Mimetite (variety campylite) with associated barite and zinc based crystals |
Locality: | Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom | |
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Dimensions: | 60mm matrix 5mm crystals |
Description: |
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Viewed: |
4102 Time(s) |
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Mineral: | Mimetite (variety campylite) with associated barite and zinc based crystals |
Locality: | Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom | |
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Dimensions: | 60mm matrix 5mm crystals |
Description: |
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Viewed: |
4100 Time(s) |
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Forrestblyth
Joined: 21 Jun 2022
Posts: 56
Location: Ne244ly
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Posted: Mar 20, 2024 09:31 Post subject: Re: Dry Gill mine, Caldbeck Fells, Cumbria, UK |
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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.
Mineral: | Mimetite (variety campylite) |
Locality: | Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom | |
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Dimensions: | 5mm crystals |
Description: |
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Viewed: |
4103 Time(s) |
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Forrestblyth
Joined: 21 Jun 2022
Posts: 56
Location: Ne244ly
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Posted: Mar 20, 2024 09:35 Post subject: Re: Dry Gill mine, Caldbeck Fells, Cumbria, UK |
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My favourite reddish hue and melon-shaped formation.
Mineral: | Mimetite (variety campylite) |
Locality: | Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom | |
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Dimensions: | 6mm |
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Viewed: |
4081 Time(s) |
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Forrestblyth
Joined: 21 Jun 2022
Posts: 56
Location: Ne244ly
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Posted: Mar 20, 2024 09:40 Post subject: Re: Dry Gill mine, Caldbeck Fells, Cumbria, UK |
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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.
Mineral: | Mimetite (variety campylite) |
Locality: | Dry Gill Mine, Caldbeck Fells, Allerdale, former Cumberland, Cumbria, England / United Kingdom | |
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Dimensions: | 5mm crystals |
Description: |
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Viewed: |
4091 Time(s) |
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Forrestblyth
Joined: 21 Jun 2022
Posts: 56
Location: Ne244ly
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Posted: Mar 20, 2024 13:14 Post subject: Re: Dry Gill Mine, Calbeck Fells, Cumbria, UK |
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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
Site Admin
Joined: 30 Apr 2008
Posts: 2147
Location: Oklahoma
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Posted: Mar 20, 2024 13:35 Post subject: Re: Dry Gill Mine, Caldbeck Fells, Cumbria, UK |
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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
Joined: 21 Jun 2022
Posts: 56
Location: Ne244ly
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Posted: Mar 20, 2024 14:06 Post subject: Re: Dry Gill Mine, Caldbeck Fells, Cumbria, UK |
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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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