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Complex fluorite crystal forms - (9)
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Ru Smith




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PostPosted: Feb 03, 2013 22:36    Post subject: Re: Complex fluorite crystal forms - (9)  

Excelente Antonio! Gracias.

I made a drawing of the Great Sleddale crystal corner. Can anyone identify the green faces?



Fluorite Great Sleddale drawing.jpeg
 Description:
Fluorite, detail of the corner of a 4 mm crystal.
Great Sled Dale Mine, Keld, Swaledale, North Yorkshire, UK.
4 mm crystal on 3 cm matrix
 Viewed:  25761 Time(s)

Fluorite Great Sleddale drawing.jpeg


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Ru Smith




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PostPosted: Feb 03, 2013 22:44    Post subject: Re: Complex fluorite crystal forms - (9)  

Also interesting to see is that there's a textural difference to the hexoctahedral faces and there's a subtle angle change within the H field of the drawing which I chose not to show - it's complicated enough as is!
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nurbo




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PostPosted: Feb 03, 2013 23:16    Post subject: Re: Complex fluorite crystal forms - (9)  

Ru Smith wrote:

. Do any of yours have a little triangular facet right at the corner (the octahedron)?


You mean the face marked "O" right? I misunderstood, the answer is no, not on the California piece, Ill check the others today.

nice graphic btw
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Jordi Fabre
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PostPosted: Feb 04, 2013 07:46    Post subject: Re: Complex fluorite crystal forms - (9)  

Antonio Alcaide wrote:
Nice complex fluorites. More complexity here https://www.foro-minerales.com/forum/viewtopic.php?p=70706#70706...

and here: Fluorites from San Lino Mine and here: Fluorites from Jaimina Mine
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Ru Smith




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PostPosted: Feb 04, 2013 20:40    Post subject: Re: Complex fluorite crystal forms - (9)  

Thanks Jordi. There are some very interesting crystals in those links.

Yes, nurbo, the red face is the octahedron. So what else did you come across in your look through those northern fluorites?
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nurbo




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PostPosted: Feb 05, 2013 03:31    Post subject: Re: Complex fluorite crystal forms - (9)  

Hi Ru,
I didnt realise you meant the octahedron could form on top of the other two modifications, its pretty obvious I suppose, but sometimes I can be thick :-)

I looked through about 50 or 60 samples and found one or two that hint at these modifications but I'm not sure if it's more down to slight deformities in the lamellar structure of the cubes. rather than actual bona fide modifications,

I might go and look through my friends collection, and see if he has any.. I cant help thinking about those Fluorite's from the Schlucht valley in Germany, the ones with 54 faces., I've got a couple of micro's but I dont think my old camera is going to get a decent photo of them, I'll have a go at it but if can anyone else chip in with one, that'd be good.
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Ru Smith




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PostPosted: Feb 05, 2013 20:55    Post subject: Re: Complex fluorite crystal forms - (9)  

So, I came across a little (3 mm) blue cube with tetrahexahedron (double bevels on the edges) on specularite from the Florence Mine, the only one I have seen so far.


Fluorite tetrahex Ullcoats.jpg
 Description:
Fluorite, detail of 3 mm crystal.
Ullcoats workings, Florence Mine, W Cumberland, found 1994.
Fluorite crystals to 3 mm on 65 mm specularite matrix
 Viewed:  25492 Time(s)

Fluorite tetrahex Ullcoats.jpg


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Ru Smith




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PostPosted: Feb 05, 2013 21:12    Post subject: Re: Complex fluorite crystal forms - (9)  

Too much depth of field doesn't help with these pictures since the crystals are transparent, so here's that crystal again, with only the shallowest few photos stacked.


Fluorite tetrahex Ullcoats 2.jpg
 Description:
Fluorite, detail of 3 mm crystal.
Ullcoats workings, Florence Mine, W Cumberland, found 1994.
as above
 Viewed:  25472 Time(s)

Fluorite tetrahex Ullcoats 2.jpg


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Ru Smith




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PostPosted: Feb 06, 2013 19:29    Post subject: Re: Complex fluorite crystal forms - (9)  

and today I found some nice examples from the Hollywell Mine (Co Durham) showing the tetrahexahedron. Looking definitely helps with seeing.


Fluorite Hollywell hexa 1.jpg
 Description:
Fluorite showing cube and tetrahexahedron on quartz.
Hollywell Mine, Stanhope, Co Durham, UK. 75 mm specimen with crystals to 15 mm.
 Viewed:  25423 Time(s)

Fluorite Hollywell hexa 1.jpg



Fluorite Hollywell hexa 2.jpg
 Description:
Fluorite showing cube and tetrahexahedron on quartz.
Hollywell Mine, Stanhope, Co Durham, UK. 75 mm specimen with crystals to 15 mm.
 Viewed:  25418 Time(s)

Fluorite Hollywell hexa 2.jpg



Fluorite Hollywell hexa 3.jpg
 Description:
Fluorite showing cube and tetrahexahedron on quartz
Hollywell Mine, Stanhope, Co Durham, UK.
75 mm specimen with crystals to 15 mm.
 Viewed:  25440 Time(s)

Fluorite Hollywell hexa 3.jpg


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nurbo




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PostPosted: Feb 06, 2013 23:53    Post subject: Re: Complex fluorite crystal forms - (9)  

Hi Ru,
Out of interest do you find that on these pieces the modifications are present on every cube, just the odd one or as I found on the California Mine piece, different for different generations of crystallization ? Ive been too busy with work to get around to continuing my hunt for these modifications, Im hopeful that at the weekend I may continue the quest.

Great photo's by the way.
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Ru Smith




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PostPosted: Feb 07, 2013 19:54    Post subject: Re: Complex fluorite crystal forms - (9)  

Thanks nurbo,

It varies. I only found one crystal showing the edge modifications on the Ullcoats specimen, whereas most of the Hollywell crystals on that specimen show them - and none of my other Hollywell specimens show any edge or corner modifications at all.
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nurbo




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PostPosted: Feb 09, 2013 05:16    Post subject: Re: Complex fluorite crystal forms - (9)  

I discovered 2 more yesterday, one on a sample from Birkett Common in Cumbria and one on a sample i got at Bakewell for £1 labelled "Cowshill" which is a village in Weardale, i'll see if I can get that locality sorted out and get some photo's up in the next couple of days.
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Ru Smith




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PostPosted: Feb 11, 2013 22:06    Post subject: Re: Complex fluorite crystal forms - (9)  

Looking forward to the photos, nurbo!
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nurbo




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PostPosted: Feb 23, 2013 09:45    Post subject: Re: Complex fluorite crystal forms - (9)  

"A couple of days" hmmm! well 14 :-)

Here is the Birkett Common piece, the Cowshill piece and a Florence Mine piece I've photographed with these modifications. though Im not sure about the Birkett Common one, the curvature at the edges makes me wonder though. The Florence piece is a bit hard to make out, its where the light reflected off the edge I was trying to capture, slightly to the left of centre just above the middle..



2.jpg
 Description:
Fluorite
Birkett Common, nr Kirkby Stephen, Cumbria, England, UK.
Fluorite to 10 mm
 Viewed:  24866 Time(s)

2.jpg



Cowshill Fluorite to 8 mm.jpg
 Description:
Fluorite
Cowshill, Weardale, County Durham, England, UK.
Fluorite to 8 mm
 Viewed:  24924 Time(s)

Cowshill Fluorite to 8 mm.jpg



Florence mine cubes to 3 mm.jpg
 Description:
Fluorite
Florence Mine, Egremont, Cumbria, England, UK.
Fluorite to 3 mm
 Viewed:  24908 Time(s)

Florence mine cubes to 3 mm.jpg


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Ru Smith




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PostPosted: Feb 23, 2013 18:49    Post subject: Re: Complex fluorite crystal forms - (9)  

Great stuff, nurbo. Good to see these.
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Philip Mostmans




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PostPosted: Feb 27, 2013 10:46    Post subject: Re: Complex fluorite crystal forms - (9)  

Very interesting discussion.
As I am cataloging my Fluorite collection I usually can't go any further than describing "modified or bevelled edges".

I wan't to learn how to identify them and correctly name them. What is a good way to start? What books can you recommend for the beginner?
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Ru Smith




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PostPosted: Feb 27, 2013 21:06    Post subject: Re: Complex fluorite crystal forms - (9)  

Greetings Philip,

I’d look at the images provided by Roger Warin and Pete Richards on the first page of this thread for the corner modifications: hexoctahedron, trapezohedron and trisoctahedron. Nurbo and I show examples with both trapezohedron and hexoctahedron present. For the edge modifications (dodecahedron with single bevel and tetrahexahedron with double bevel), take a look at the images provided by John Medici.

Do you have some photos to share?
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Ru Smith




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PostPosted: Mar 09, 2013 14:06    Post subject: Re: Complex fluorite crystal forms - (9)  

Another nice hexoctahedral corner from Burtree Slitts.


Fluorite Burtree Slitts hexoct.jpg
 Description:
Fluorite on siderite coated with pyrolusite
Burtree Slitts, Cowshill, Weardale, Co Durham, UK.
6 mm interpenetrant twin on 16 mm matrix.
 Viewed:  24467 Time(s)

Fluorite Burtree Slitts hexoct.jpg


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Ru Smith




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PostPosted: Mar 09, 2013 18:29    Post subject: Re: Complex fluorite crystal forms - (9)  

An Emilio Mine, Asturias example.


Fluorite Emilio 1.jpg
 Description:
Fluorite
Emilio Mine, Loroñe, Obdulia vein, Colunga District, Caravia mining area, Asturias, Spain.
15 mm crystal on 45 mm baryte matrix.
 Viewed:  24375 Time(s)

Fluorite Emilio 1.jpg



Fluorite Emilio 2.jpg
 Description:
Fluorite
Emilio Mine, Loroñe, Obdulia vein, Colunga District, Caravia mining area, Asturias, Spain.
15 mm crystal on 45 mm baryte matrix.
 Viewed:  24369 Time(s)

Fluorite Emilio 2.jpg



Fluorite Emilio 3.jpg
 Description:
Fluorite
Emilio Mine, Loroñe, Obdulia vein, Colunga District, Caravia mining area, Asturias, Spain.
15 mm crystal on 45 mm baryte matrix.
 Viewed:  24408 Time(s)

Fluorite Emilio 3.jpg



Fluorite Emilio 4.jpg
 Description:
Fluorite
Emilio Mine, Loroñe, Obdulia vein, Colunga District, Caravia mining area, Asturias, Spain.
15 mm crystal on 45 mm baryte matrix.
 Viewed:  24421 Time(s)

Fluorite Emilio 4.jpg


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Ru Smith




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PostPosted: Apr 26, 2013 16:42    Post subject: Re: Complex fluorite crystal forms - (9)  

Another couple of pictures to add.


Fluorite Okorusu cuboctahedra.jpg
 Description:
Fluorite cuboctahedra.
Okorusu Mine, Otjiwarongo, Namibia.
Crystals to 25 mm across in 43 mm group.
 Viewed:  23786 Time(s)

Fluorite Okorusu cuboctahedra.jpg



Fluorite Jaimina cubedodecahedra.jpg
 Description:
Fluorite cubedodecahedra.
Mina Jaimina, Asturias, Spain.
Crystals to 10 mm on edge in 44 mm group.
 Viewed:  23770 Time(s)

Fluorite Jaimina cubedodecahedra.jpg


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