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Complex fluorite crystal forms - (9)
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Ru Smith




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PostPosted: Feb 02, 2013 00:28    Post subject: Complex fluorite crystal forms - (9)  

I just took this close-up of a Hilton Mine fluorite (reducing the depth of field to avoid the distraction of the internal transparency of the crystal). Who can decipher which forms result in such complex modification of the corners?


Hilton fluorite detail.jpg
 Description:
Fluorite
Hilton Mine, Scordale, Cumbria, England
1 cm twin on 4.5 cm matrix
 Viewed:  42877 Time(s)

Hilton fluorite detail.jpg


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Roger Warin




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PostPosted: Feb 02, 2013 04:23    Post subject: Re: Complex fluorite crystal forms - (9)  

Hello,
The cube is truncated by a hexoctahedral form on every corner.
I add a picture in a future post.
Roger.
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Roger Warin




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PostPosted: Feb 02, 2013 05:13    Post subject: Re: Complex fluorite crystal forms - (9)  

You have a beautiful fluorite and these truncations are not so frequent.
The result of calculation with the Miller indices {137} is put on drawing.
These values are a visual interpretation of the picture. To confirm, it is necessary to measure the dihedral angles between the various faces.
So your fluorite has 54 faces, 56 corners and 108 edges in a single euhedral crystal .
Roger.



Fluorite-hexoct.jpg
 Description:
Fluorite
 Viewed:  42741 Time(s)

Fluorite-hexoct.jpg


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Jesse Fisher




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PostPosted: Feb 02, 2013 09:27    Post subject: Re: Complex fluorite crystal forms - (9)  

While modifications to the cube other than twinning are not commonly seen on Northern English fluorites, I have seen hexoctahedral corners on a few other specimens, including one that I have from the Boltsburn Mine. Rare but not unknown.
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J Rafael




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PostPosted: Feb 02, 2013 09:49    Post subject: Re: Complex fluorite crystal forms - (9)  

Nice sample. It's like fluorites from Emilio Mine
https://www.mindat.org/photo-11832.html

J. Rafael
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Roger Warin




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PostPosted: Feb 02, 2013 10:03    Post subject: Re: Complex fluorite crystal forms - (9)  

Speaking fluorite, here is a well-presented.
Roger.



Fluorite#1_R.jpg
 Description:
Fluorite, quartz, dolomite
Hunan, China
 Viewed:  42721 Time(s)

Fluorite#1_R.jpg


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Ru Smith




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PostPosted: Feb 02, 2013 11:08    Post subject: Re: Complex fluorite crystal forms - (9)  

Fantastic guys! This definitely adds to my enjoyment of the crystal.

Roger, that is a wonderful summary. What software do you use for the crystal drawing?

I agree with Jesse that these combinations of cubes with hexoctahedra occur elsewhere in this region. I have examples from Seata, Wetgrooves and Great Sleddale in Yorkshire; Burtree Slitts in Weardale and the Diana Vein specimens from Northumberland that we looked at a couple of days ago also show this form.

Delightful specimen from the Emilio Mine J Rafael. Thanks for showing that.
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Roger Warin




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PostPosted: Feb 02, 2013 11:32    Post subject: Re: Complex fluorite crystal forms - (9)  

I use an older version of Dowty’s SHAPE (1995).
Roger.
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Pete Richards
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PostPosted: Feb 02, 2013 13:38    Post subject: Re: Complex fluorite crystal forms - (9)  

Cubes with corners modified by hexoctahedra (specifically {137}) are fairly common in fluorite from northern Ohio. Other cubes are often modified by the trapezohedron {113}, often mistaken for a trisoctahedron since three faces occur where each octahedron face would be. See drawings for subtle distinction.


fluorite.jpg
 Description:
Fluorite
various localities, northwest Ohio, USA
 Viewed:  42557 Time(s)

fluorite.jpg



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Ru Smith




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PostPosted: Feb 02, 2013 17:25    Post subject: Re: Complex fluorite crystal forms - (9)  

That's excellent Pete. Thank you.

I just looked through the fluorites and found some more examples of cubes with hexoctahedra, but also two specimens showing cube with trapezohedron (both from Yorkshire). Most specimens lack these corner modifications.

I'll take some more photos a bit later, but here's one of each.



Fluorite crystal detail Clouds Mine Cumbria 1.jpg
 Description:
Fluorite showing hexoctahedral corner modifications.
Clouds Mine, Ravenstonedale, Kirkby Stephen, Cumbria, UK.
5 mm crystal on 5 cm matrix.
 Viewed:  42614 Time(s)

Fluorite crystal detail Clouds Mine Cumbria 1.jpg



Fluorite Wetgrooves 1.jpg
 Description:
Fluorite showing trapezohedral corner modifications.
Wetgrooves Mine, Askrigg, Wensleydale, N Yorkshire, UK.
Crystals to 8 mm on 45 mm matrix.
 Viewed:  42537 Time(s)

Fluorite Wetgrooves 1.jpg


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Ru Smith




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PostPosted: Feb 02, 2013 17:31    Post subject: Re: Complex fluorite crystal forms - (9)  

and I have found one (just 4 mm across), from Great Sleddale with both hexoctahedron and trapezohedron.
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John Medici




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PostPosted: Feb 02, 2013 22:40    Post subject: Re: Complex fluorite crystal forms - (9)  

Thanks for the diagrams, Roger and Pete. I'm still learning. Following are a few northwest Ohio modified fluorites. Let me know if I have wrong modification ID. Thanks.


006OHfluorite -Bluffton'94-tetrahex-trapez-cube.jpg.jpg
 Description:
fluorite
Bluffton, Ohio
1 cm
tetrahex-trapezohedron modif.?
 Viewed:  42625 Time(s)

006OHfluorite -Bluffton'94-tetrahex-trapez-cube.jpg.jpg



070OHfluorite-AuglaizeQ-tetrahex-cube.jpg.jpg
 Description:
fluorite
Auglaize quarry, Junction, Ohio
1.5 cm field of view
tetrahex, hexoct modif. ?
 Viewed:  42528 Time(s)

070OHfluorite-AuglaizeQ-tetrahex-cube.jpg.jpg



071OHfluorite-AuglaizeQ-phantoms-tetrahex-cube(1.0x0.8cm).jpg.jpg
 Description:
fluorite with phantoms
Auglaize quarry, Junction, Ohio
0.8 cm
tetrahex-hexoct ?
 Viewed:  42501 Time(s)

071OHfluorite-AuglaizeQ-phantoms-tetrahex-cube(1.0x0.8cm).jpg.jpg



009OHfluorite-Delphos'87-dodec-cube.jpg.jpg
 Description:
fluorite
Suever Quarry, Delphos, Ohio
0.9 cm
dodecahedron modif. These occur often in this quarry, but usually only one pair of cube faces is modified.
 Viewed:  42624 Time(s)

009OHfluorite-Delphos'87-dodec-cube.jpg.jpg



011OHfluorite-Bluffton'89-trapez-hexoct-cube.jpg.jpg
 Description:
fluorite
Bluffton Stone Co. quarry, Bluffton, Ohio
1 cm
trapezohedron-hexoctahedron modif.? Same modification has been found at the upper level in Delphos in the bicolor (yellow/purple) fluorite.
 Viewed:  42592 Time(s)

011OHfluorite-Bluffton'89-trapez-hexoct-cube.jpg.jpg



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Ru Smith




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PostPosted: Feb 02, 2013 22:44    Post subject: Re: Complex fluorite crystal forms - (9)  

Well look at this! I can see cube, octahedron, trapezohedron and hexoctahedron. There's another form in there too; look at the very subtle bevels at either side of the trapezohedron face at left. Could that be the trisoctahedron?

How many faces, corners and edges do you reckon, Roger?



Fluorite corner Great Sleddale 1.jpg
 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:  42529 Time(s)

Fluorite corner Great Sleddale 1.jpg


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Ru Smith




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PostPosted: Feb 02, 2013 22:50    Post subject: Re: Complex fluorite crystal forms - (9)  

Lovely specimens, John.

I hadn't seen the tetrahexahedron (double bevel on cube edges) before. I once had some beautiful Naica specimens showing dodecahedral faces, but they've been lost along the way unfortunately.

These complex crystal forms definitely add to the interest.
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PostPosted: Feb 02, 2013 22:52    Post subject: Re: Complex fluorite crystal forms - (9)  

Those subtle bevels can't be the trisoctahedron now I look again, but must be another form.
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PostPosted: Feb 02, 2013 23:47    Post subject: Re: Complex fluorite crystal forms - (9)  

Sorry, I missed labeling a dodecahedron face, between the tetrahex faces on my Bluffton specimen (my number 006).
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PostPosted: Feb 03, 2013 07:34    Post subject: Re: Complex fluorite crystal forms - (9)  

Here is one from the California Mine in Teesdale, it seems these are rare but widespread in the North of England, when I get a chance I'll be checking all my Fluorite's for these modifications, The crystal in the second photo seems to have a further modification which is quite hard to see in the picture so Ive cobbled together a drawing which is inaccurate but shows what it looks like.


Fluorite California.jpg
 Description:
Eggleshope, Teesdale, Co Durham, England, UK.
Fluorite to 5 mm
 Viewed:  42313 Time(s)

Fluorite California.jpg



Fluorite California 2.jpg
 Description:
Eggleshope, Teesdale, Co Durham, England, UK.
Fluorite to 8 mm
 Viewed:  42348 Time(s)

Fluorite California 2.jpg



California edge drawing.jpg
 Description:
 Viewed:  42348 Time(s)

California edge drawing.jpg


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Ru Smith




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PostPosted: Feb 03, 2013 12:01    Post subject: Re: Complex fluorite crystal forms - (9)  

Great stuff, nurbo.

So, you have found another example with both trapezohedron and hexoctahedron showing. Do any of yours have a little triangular facet right at the corner (the octahedron)?
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PostPosted: Feb 03, 2013 13:56    Post subject: Re: Complex fluorite crystal forms - (9)  

Hi Ru,
If i'm understanding you correctly yes, i've a few with the octahedron,and some Galena's that show it too, Im really glad you started this thread, it made me remember the edges on this one and set me off trying to find it I couldnt remember the locality either, eventually I found it in with the samples I have for trading or giving to people.

a couple of observation's on the California Mine piece ... the Fluorite cube's with the trapezohedral modification are an earlier generation than the the ones with both,trapezohedral and hexoctahedral, i also noticed that the trapezohedral modifications are present on the raised edges on the face of the first generation of cubes as well, when the sun comes back up I'll try and get some better photo's.
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Antonio Alcaide
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PostPosted: Feb 03, 2013 18:21    Post subject: Re: Complex fluorite crystal forms - (9)  

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

in Spanish, with deeply complex crystals from Cillargas, Spain (in the link) and Jaimina Mine, Asturias, Spain (more hexoctahedra called hexaquisoctahedra in Europe) as well as tetrahexahedron on a Naica specimen, as Ru commented (see the previous posts).

Regards

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