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Trapiche Pezzottaite
  
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Elise




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PostPosted: Nov 26, 2015 09:37    Post subject: Trapiche Pezzottaite  

This is a new report which may be of interest: Skalwold, E.A. and Koivula, J.I. (2015) "Pezzottaite Debuts as the Newest Trapiche Gem Mineral." Gems & Gemology, (51)3,326-328. This is one of several articles in our latest Micro-world quarterly column which will hopefully appeal to those in the mineralogy world as well as that of gemology. The hard copies are being mailed out, but the articles are also now freely available on the website as well: https://www.gia.edu/gems-gemology/fall-2015-microworld-pezzottaite-debuts-trapiche-gem-mineral (Link normalized by FMF).

When studying the crystals, one aspect I found really interesting was the eye-visible pleochroism. This is a view down the c-axis/optic axis; a much deeper color is seen perpendicular to that and with polarized light is revealed to be orangey and purplish dichroism - I didn't mention this in the article; we are limited to briefs and style consistent with the Lab Notes and Gem News International format, otherwise I could have gone on for 10 pages or more!
Cheers!
Elise



Pezzottaite_trapiche.jpg
 Mineral: Pezzottaite (variety trapiche)
 Locality:
Myanmar (Burma)
 Dimensions: 8.32 x 7.60 x 5.80 mm
 Description:
2.33 ct doubly terminated trapiche crystal; c-axis view; Origin: Burma (photo: Elise A. Skalwold).
 Viewed:  9185 Time(s)

Pezzottaite_trapiche.jpg



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Don Lum




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PostPosted: Nov 26, 2015 21:43    Post subject: Re: Trapiche Pezzottaite  

Absolutely beautiful, Elise.

Don

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Elise




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PostPosted: Mar 14, 2016 11:06    Post subject: Re: Trapiche Pezzottaite  

At John White's suggestion I ended up writing a Letter to the Editor regarding trapiche nomenclature. It was recently published along with the authors' response regarding their paper on trapiche emeralds in which they defined "trapiche" and "trapiche-like." Skalwold, E.A.(2015) Letter: trapiche nomenclature. Gems & Gemology, Vol. 51, No. 4, page 463
https://www.gia.edu/gems-gemology/winter-2015-letters-trapiche-nomenclature
(link normalized by FMF)

Since in the letter I referred to the above pezzoitaite specimen and compared it with "cherry blossom stones" I thought I would add the letter to this thread, rather tban cause a distraction in the Trapiche Emerald thread here: https://www.mineral-forum.com/message-board/viewtopic.php?t=965 (don't miss that - there are some spectacular photos and examples as well as discussion of nomenclature).

There seems to be a very enthusiastic and very broad sense of the word "trapiche" accompaying a growing passion for collecting them both in the mineral world and the gem world - with the only criteria being that of having 6 spokes. Maybe others would post examples and continue the discussion.

Best wishes,
Elise



Sukura_Ishi_8375a96sm.jpg
 Description:
Sukura Ishi Cherry Blossom Stones
Indialite cordierite intergrowths, pseudomorphed by muscovite (Japan, Kyoto, Kameoka). Central large specimen approx. 25x13x11 mm.
 Viewed:  8108 Time(s)

Sukura_Ishi_8375a96sm.jpg



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John Jaszczak




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PostPosted: Mar 14, 2016 12:12    Post subject: Re: Trapiche Pezzottaite  

Thanks Elise.
But I have to say that after reading the Gems & Gemology thread that I'm now confused.
Best wishes,
John

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Elise




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PostPosted: Mar 14, 2016 13:23    Post subject: Re: Trapiche Pezzottaite  

Hi John,

I'm just thinking that it's a very interesting discussion from different points of view and maybe a kind of "Ownership of Words" [referring to my friend Dick Hughes' paper entitled "The Ownership of Words: an essay on the meaning of padparadscha"] or that as an avid collector of these fascinating little enigmas, I just want to call cherry blossom stones "super trapiches!" :-) Maybe the first mineral referred to as trapiche do get to own the name, but the collectors seem to be off and running with an ever-widening definition of their own (see the K. Nassau AmMin paper reference and also see John Rakovan's R&M paper on the cherry blossom stones).

In regards to that of trapiche, someone in the Trapiche Emerald thread asked about chiastolite structure . There is a really good open-source paper that I can't find right now to link to, though for now I'd highly recommend another paper entitled: "Chiastolite" by Roger Mason, Kevin W. Burton, Yanming Yuan, Zhenbing She (2010) Gondwana Research, Volume 18, Issue 1, July 2010, Pages 222–229. The G&G main article on trapiche emeralds includes chiastolites as true trapiche structure, so apparently the collecting desire for 6 spokes may not apply here.

Best wishes,
Elise



chiastolite_sm.jpg
 Description:
A large 120x40x30 mm adalusite variety chiastolite crystal along with a polished slice (25x25x5 mm) and a polished crystal tip (10x15x15 mm); origins unknown.
 Viewed:  8022 Time(s)

chiastolite_sm.jpg



chiastolite_178.jpg
 Description:
Strong eye-visible pleochroism in a polished slice cut perpendicular to the c axis, viewed with transmitted non-polarized light. Approx. 25x25x5 mm; origin unknown.
 Viewed:  8075 Time(s)

chiastolite_178.jpg



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