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Vanadinite Crystals

 
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Walter Piorkowski



Joined: 14 Aug 2006
Posts: 684
Location: South Beloit, Ill

PostPosted: Sun Feb 04, 2018 9:49 pm    Post subject: Vanadinite Crystals Reply with quote





Vanadinite Crystals

A rock shop purchase put me in possession of some minute vanadinite crystals although larger ones can be had. I had always thought of crystal growth as following an orderly, uniform process. These very tiny crystals seem to have grown in total chaos.
I also assumed that the face surfaces would be smooth and inviolate to further growth. I was wrong on both counts. Stacked images

Walt

All images 6x on camera sensor. 4x objective.
Canon 50D on Leitz Ortholux microscope.
Zerene and Photoshop processing.
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 19323
Location: Richland, Washington State, USA

PostPosted: Sun Feb 04, 2018 11:23 pm    Post subject: Reply with quote

Lovely images!

Each of the crystals probably started from a single seed, with the seeds in random orientations. Growing outward from each seed, the crystal structure will be very orderly, until it happens to run into a crystal that is oriented differently because it is growing from a different seed. Then you get these beautiful intersecting structures.

In the few cases where we see small crystals sitting on the face of a large crystal, I would normally interpret those as due to small seeds that happened to fall onto the surface after the large crystal was well underway.

That explanation works very well for the first image, where the large and small crystals appear to have random orientations.

It does not work so well for the second image, right side, where all of the small crystals appear to have the same orientation as the large crystal. I do not have a comfortable explanation for what's happening there.

Spontaneous growth from the face does not seem likely, especially given the many other pristine faces. But it also does not seem likely that several new seeds would fall randomly in just the right orientation to produce the alignment that we see in the image. A fine mystery!

--Rik
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ChrisR
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Joined: 14 Mar 2009
Posts: 7869
Location: Near London, UK

PostPosted: Mon Feb 05, 2018 6:05 am    Post subject: Reply with quote

I don't have comfortable explanations either, but small forces promote stacking faults in the lattice which then favour growth on different facets. Small changes in source element concentrations or temperature, likewise.

This is a crystal of the same stuff. Presumably there was less energy-based favouritism for particular growth facets here:
https://4.bp.blogspot.com/-aOEe_FsEpUc/WfC651sFO7I/AAAAAAAANws/SmWFq4n5VnYJilF_3zmZ06aj-SC_QW2mwCLcBGAs/s1600/Vanadinite%2B%25281%2529.jpg
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Jacek



Joined: 02 Oct 2011
Posts: 5092
Location: Poland

PostPosted: Mon Feb 05, 2018 8:54 am    Post subject: Reply with quote

Very nice
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https://photos.app.goo.gl/MV9IynUtBdaKkVj53
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pwnell



Joined: 18 Dec 2009
Posts: 1987
Location: Tsawwassen, Canada

PostPosted: Mon Feb 05, 2018 12:41 pm    Post subject: Reply with quote

These are pretty cool.
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Sumguy01



Joined: 28 Jan 2013
Posts: 1154
Location: Ketchikan Alaska USA

PostPosted: Tue Feb 06, 2018 9:25 pm    Post subject: Reply with quote

Applause Very nice.
Thanks for sharing.
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Walter Piorkowski



Joined: 14 Aug 2006
Posts: 684
Location: South Beloit, Ill

PostPosted: Thu Feb 08, 2018 11:50 am    Post subject: Reply with quote

Gentlemen, thank you all for your comments.
Hi Rik. Thanks for the detailed look. You have a keen eye. I had not noticed the similar orientation of the small face crystals on the lower right image. Chris. I looked at your linked image. It’s interesting that they consider this vanadinite. It is so different from the shape of the crystals that I imaged. I love the translucence the photographer captured. I am hoping to capture something like that in the future.
Walt
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billben74



Joined: 09 Apr 2016
Posts: 145
Location: Cambridge, UK

PostPosted: Thu Feb 08, 2018 2:39 pm    Post subject: Reply with quote

Nice images. I love three dimensional crystal pics and these are fine examples.
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Walter Piorkowski



Joined: 14 Aug 2006
Posts: 684
Location: South Beloit, Ill

PostPosted: Sat Feb 10, 2018 2:45 pm    Post subject: Reply with quote

Thank you billben. Glad that you like them.
Walt
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