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A "complete" Dauphiné twin of quartz - (21)
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Jordi Fabre
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PostPosted: Sep 03, 2014 15:00    Post subject: A "complete" Dauphiné twin of quartz - (21) moved to the FC of FMF section  
Moved to the Featured Columns of FMF section. To know more about this section please read: What is "Featured Columns of FMF"?
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Duncan Miller




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PostPosted: Sep 06, 2014 11:37    Post subject: Re: A "complete" Dauphiné twin of quartz - (21)  
It might assist some people following this thread to read Amir Akhavan's description of twinning in quartz and how to identify the various twins.
https://www.quartzpage.de/crs_twins.html
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Elise




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PostPosted: Sep 10, 2014 11:03    Post subject: Re: A "complete" Dauphiné twin of quartz - (21)  
It has been such a pleasure to watch The Quartz Page website grow over the years.
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PostPosted: Sep 10, 2014 11:43    Post subject: Re: A "complete" Dauphiné twin of quartz - (21)  
Peter Megaw wrote:
...I have collected pockets in Arizona where perhaps 10% showed X faces and unpacked barrels of Brazilian quartz where we were separating them because the metaphysical crowd liked right handed crystals better and would pay a premium for them...


OK, I'll bite - the only possible reason I could imagine for this would be a misunderstanding of the property as it relates to oscillators / resonators. Almost all of the synthetic quartz grown is right-handed. I assume that is simply by convention since there is no difference between left-handed and right-handed crystals (other than handedness), though you wouldn't want to mix the two thereby defeating the purpose of using untwinned quartz to begin with.

As I had written last year under a different thread, I find such things a bit discouraging: https://www.mineral-forum.com/message-board/viewtopic.php?p=33695&highlight=#33695 It is great that Pete found such a nice specimen for a very lucky price and that he could use it to illustrate the twinning for us here!
Pete Richards wrote:
Because such things are rather esoteric and not understood by many collectors and dealers, this remarkable crystal was also a bargain at a price of $10!


Cheers,
Elise
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