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Naica Mine - (11)
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Gerhard Niklasch




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PostPosted: Apr 19, 2010 16:20    Post subject: Re: Naica Mine - (11)  

Many thanks for the illuminating diagrams!

Yeah, I had been struggling with the identification for quite a while, and had to throw away several wrongly annotated pictures before coming up with the above.
(Never trust a mathematician who embarks on actual calculation!)

Perhaps it's just me - I'm finding finding myself even more readily confused when these forms modify an octahedron rather than a cube...

Cheers, Gerhard
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Peter Megaw
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PostPosted: Apr 19, 2010 16:47    Post subject: Re: Naica Mine - (11)  

Pete...taking this one step further. Apologizing in advance for the picture...here's a close up of a trapezohedron on a Naica fluorite...modified by a face that cuts off its triple junction. There would be 6 of these in the form, negative octahedron or negative cube...or something else altogether?


Naica trap mod.jpg
 Description:
 Viewed:  34567 Time(s)

Naica trap mod.jpg



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Peter Megaw
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PostPosted: Apr 19, 2010 16:51    Post subject: Re: Naica Mine - (11)  

A few more nica Naica fluorites!


Naica fluorite shelf.jpg
 Description:
Shelf of Naica fluorites
 Viewed:  34589 Time(s)

Naica fluorite shelf.jpg



Naica galena phantom in fluorite.jpg
 Description:
Pocket mate of Gerhard's specimen...6 cm across
 Viewed:  34591 Time(s)

Naica galena phantom in fluorite.jpg



Naica spinel twin fluorite.jpg
 Description:
Naica spinel twinned fluorite...with large enhydro. 8 cm across
 Viewed:  34640 Time(s)

Naica spinel twin fluorite.jpg



Naica oct fluorite 2.jpg
 Description:
Naica octahedron 10 cm on an axis
 Viewed:  34587 Time(s)

Naica oct fluorite 2.jpg



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Peter Megaw
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PostPosted: Apr 19, 2010 16:54    Post subject: Re: Naica Mine - (11)  

A break from fluorite...a couple "seldom-seens"


Naica pyrite worm.jpg
 Description:
Pyrite "worms" on quartz 5 cm across
 Viewed:  34673 Time(s)

Naica pyrite worm.jpg



Naica epidote.jpg
 Description:
Calcite on epidote from Naica
 Viewed:  34622 Time(s)

Naica epidote.jpg



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Gerhard Niklasch




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PostPosted: Apr 19, 2010 17:05    Post subject: Re: Naica Mine - (11)  

Peter Megaw wrote:
here's a close up of a trapezohedron on a Naica fluorite...modified by a face that cuts off its triple junction. There would be 6 of these in the form, negative octahedron or negative cube...or something else altogether?


I think you'll find there are actually eight of these in the form. They belong indeed to an octahedron {111}. I'm not sure whether "negative octahedron" is the correct term (there's only one octahedron under the full symmetry group); but the little triangles are oriented opposite to the full {111} triangles - the trapezohedron cuts off the corners of the latter.

-- And that's a nice Naica gallery you have there!

Cheers, Gerhard
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John S. White
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PostPosted: Apr 20, 2010 04:37    Post subject: Re: Naica Mine - (11)  

An old rule that I remember to help distinguish between the two forms described by Pete is to note the orientation of the Y formed by the faces of the form in the corner of the cube. If the Y is upright, the form is the trapezohedron. If the Y is inverted, we are seeing the trisoctahedron.
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Peter Megaw
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PostPosted: Apr 20, 2010 10:07    Post subject: Re: Naica Mine - (11)  

So...to coin a mnenomic..."Y"es its a Trapezohedron
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javmex2




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PostPosted: Mar 08, 2011 15:47    Post subject: Re: Naica Mine - (11)  

Hi, hope you like this photograph, is a real beauty of Mineral Naica Chihuahua Mexico.


DSC09635.JPG
 Description:
Naica Chihuahua Mexico.
anidrithe, calcite.
 Viewed:  33729 Time(s)

DSC09635.JPG


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Jordi Fabre
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PostPosted: May 22, 2013 12:10    Post subject: Re: Naica Mine - (11)  

One new wonderful thread to the Featured Columns of FMF! This time the topic is the Naica Mine (see above)

Please continue developing it, a great mine needs a great thread! ;-)
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Mark Ost




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PostPosted: May 22, 2013 15:01    Post subject: Re: Naica Mine - (11)  

Beautiful
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Ru Smith




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PostPosted: May 23, 2013 20:41    Post subject: Re: Naica Mine - (11)  

Galena pseudohexagonal penetration twins with chalcopyrite.


Galena penetration twins Naica.jpg
 Description:
Galena and chalcopyrite.
Naica, Chihuahua, Mexico.
5 cm specimen with galena twins to 1 cm.
 Viewed:  31396 Time(s)

Galena penetration twins Naica.jpg


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Ru Smith




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PostPosted: May 23, 2013 21:04    Post subject: Re: Naica Mine - (11)  

Gem pseudohexagonal penetration twin of fluorite.

Sulphosalt wires and enhydros are visible through the lustrous smooth dodecahedron and cube faces of the twin. Octahedron and trapezoidal icositetrahedron faces are rough, being composed of numerous tiny stepped cube terminations. Twin boundaries cross the edges of the front octahedral face (see the spinel twins thread for a drawing) and juxtapose dodecahedron (smooth) and icositetrahedron (rough) faces.



Fluorite penetration twin Naica.jpg
 Description:
Fluorite gem pseudohexagonal penetration twin.
Naica, Chihuahua, Mexico.
22 mm.
 Viewed:  31530 Time(s)

Fluorite penetration twin Naica.jpg


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Ru Smith




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PostPosted: May 23, 2013 21:17    Post subject: Re: Naica Mine - (11)  

I brought this back as a teenager (travelling the US by Greyhound bus).


Gypsum 16cm Naica.jpg
 Description:
Gypsum.
Naica, Chihuahua, Mexico.
16 cm crystal.
 Viewed:  31354 Time(s)

Gypsum 16cm Naica.jpg


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Turbo




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PostPosted: May 23, 2013 21:33    Post subject: Re: Naica Mine - (11)  

A little Baryte from Naica.


photo_copy_471.jpg
 Description:
Baryte
Naica Mine, Naica, Mun. de Saucillo, Chihuahua, Mexico
3 x 3 cm
 Viewed:  31358 Time(s)

photo_copy_471.jpg


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Ru Smith




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PostPosted: May 23, 2013 21:55    Post subject: Re: Naica Mine - (11)  

That's lovely. I'd not seen baryte from Naica.
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Carles Curto




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PostPosted: May 24, 2013 01:03    Post subject: Re: Naica Mine - (11)  

The end of the eighties and the nineties Barcelona was a good place for Mexican minerals. I add some samples to the FMF background.


esfalerita_1991_14br.jpg
 Description:
Esfalerite + Fluorite
Naica, Saucillo, Chihuahua, Mexico
4,5 x 4,2 x 3,4 cm
Twinned crystal on a group of clear octahedral crystals of Fluorite.
 Viewed:  31214 Time(s)

esfalerita_1991_14br.jpg



galena_1988_26br.jpg
 Description:
Galena
Naica, Saucillo, Chihuahua, Mexico
5,1 x 6,9 x 4,3 cm.
Cuboctahedral Galena crystals on matrix, with Quartz and complex crystals of Sphalerite.
 Viewed:  31201 Time(s)

galena_1988_26br.jpg



galena_1988_29br.jpg
 Description:
Galena + Calcite
Naica, Saucillo, Chihuahua, Mexico
4,6 x 3,7 x 2,2 cm.
Irregular aggregate of cuboctahedral crystals on Calcite matrix.
 Viewed:  31210 Time(s)

galena_1988_29br.jpg



fluorita_1986_06br.jpg
 Description:
Fluorite + Galena
Gibraltar mine, Naica, Saucillo, Chihuahua, Mexico
5,5 x 6,8 x 4,9 cm.
transparent clear green cubic crystals beveled by the dodecahedron, with phantom growths and on matrix, with cuboctahedral Galena crystal.
 Viewed:  31228 Time(s)

fluorita_1986_06br.jpg



quars_am_1987_19br.jpg
 Description:
Quartz (amethyst) + Sphalerite
Naica, Saucillo, Chihuahua, Mexico
7,3 x 5,4 x 3,9 cm.
Prismatic crystals partially coated by Calcite and on Sphalerite matrix.
Amethyst is not especially common at Naica.
 Viewed:  31232 Time(s)

quars_am_1987_19br.jpg



anhidrita_2011_08br.jpg
 Description:
Anhydrite
Maravillas Mine, Naica, Saucillo, Chihuahua, Mexico
6,5 x 4,8 x 3,5 cm.
Aggregate of two flattened sky blue crystals partially coated by Calcite.
 Viewed:  31220 Time(s)

anhidrita_2011_08br.jpg


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Carles Curto




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PostPosted: May 24, 2013 01:11    Post subject: Re: Naica Mine - (11)  

And two more (I apologize the quality of the pictures, but I think the samples have interesting characteristics).


guix_1986_12_1br.jpg
 Description:
Gypsum
Maravillas Mine, Naica, Saucillo, Chihuahua, Mexico
9,8 x 7,5 x 2,2 cm.
Two transparent, colerless, doubly terninated crystals, one of them clearly dominant, with a small matrix.
 Viewed:  31203 Time(s)

guix_1986_12_1br.jpg



guix_1986_12_2br.jpg
 Description:
Gypsum
Maravillas Mine, Naica, Saucillo, Chihuahua, Mexico
6,2 x 3,2 x 2,0 cm.
Transparent colorless Gypsum crystal, on matrix, with inner dissolution channels conteining mobile bubbles.
 Viewed:  31246 Time(s)

guix_1986_12_2br.jpg


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Ru Smith




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PostPosted: May 24, 2013 22:20    Post subject: Re: Naica Mine - (11)  

Elegant pieces Carles. I like the sphalerite.
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am mizunaka




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PostPosted: May 25, 2013 02:29    Post subject: Re: Naica Mine - (11)  




NaicaQtzPyr.jpg
 Description:
Quartz with Pyrite after Pyrrhotite
Naica Mine, Naica, Mun. de Saucillo, Chihuahua, Mexico
10 x 6.7 cm
 Viewed:  30995 Time(s)

NaicaQtzPyr.jpg


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Ru Smith




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PostPosted: May 25, 2013 15:38    Post subject: Re: Naica Mine - (11)  

Fluorite octahedra.


Fluorite octahedra Naica.jpg
 Description:
Fluorite octahedra with calcite and pyrite.
Naica, Chihuahua, Mexico.
Octahedra to about 15 mm on 11 cm matrix.
 Viewed:  30906 Time(s)

Fluorite octahedra Naica.jpg


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