SPOTLIGHT: ALBERTO SCARANI, GG, FEATURED PRESENTATION: SYNTHETIC DIAMONDS DEMYSTIFIED: AGA LAS VEGAS, JUNE 1
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 Post subject: Trace Element characterization of tourmalines worldwide
PostPosted: Sat Jul 18, 2015 2:02 am 
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Okay....I got this reference material and findings from Al Falster at UNO. I have him send me write-up's and reports/powerpoints they use for their graduate class. This is data collected by Al, Karen Webber, and Skip Simmons. They are trying to create a database of known pegmatite tourmaline deposits from around the world. By collecting and sampling tourmalines they will be able to ID a specific location a tourmaline has come from.

Trace Element Characterization of Tourmaline from World-wide Pegmatite Locations


Color-causing elements in tourmaline

Pink and red
-Mn3+ content, also Mn2+/Mn3+ IVCT
-Color center electron trap in vacant anion position

Yellow and brown
-Ti4+/Mn2+ IVCT
-Fe3+ or Mn2+ content
-Ti4+/Ti3+ IVCT
-Hole traps of type O- in interaction with 2 Al nuclei caused by irradiation

Green, blue and black
-Fe2+ contents
-Fe2+/Fe3+ IVCT (black in high concentrations)
-V3+ or Cr3+ contents

Here are some of the samples they tested. Some of these were collected at the actual locations, if I am not mistaken. I know they have been to Mauvco and Batalha before
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Last edited by Jason Barrett on Sat Jul 18, 2015 4:06 am, edited 2 times in total.
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 Post subject: Re: Trace Element characterization of tourmalines worldwide
PostPosted: Sat Jul 18, 2015 2:06 am 
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Here are a bunch of dissolved tourmaline samples, diluted to 35ml
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 Post subject: Re: Trace Element characterization of tourmalines worldwide
PostPosted: Sat Jul 18, 2015 2:20 am 
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Here are some pretty decent looking samples of tourmalines from different locations like Namibia, Brazil, and Afghanistan. This picture was taken right before these crystals got fused and dissolved..... :shock:
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PINK TOURMALINE
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 Post subject: Re: Trace Element characterization of tourmalines worldwide
PostPosted: Sat Jul 18, 2015 2:22 am 
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GREEN TOURMALINE
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 Post subject: Re: Trace Element characterization of tourmalines worldwide
PostPosted: Mon Dec 12, 2016 5:19 pm 
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Fascinating. Thanks for this Jason.
Will there be a paper from you and Al?
Bear


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 Post subject: Re: Trace Element characterization of tourmalines worldwide
PostPosted: Mon Dec 12, 2016 7:35 pm 
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Thanks Jason. Excellent!


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 Post subject: Re: Trace Element characterization of tourmalines worldwide
PostPosted: Fri Dec 16, 2016 1:13 am 
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Jason,

Excellent work! And thanks for including the various Maine Tourmalines... It's good to see that those classic locations are being studied and not forgotten.
I never got to Dunton or Newry, but did go through Mount Mica and was able to pick up a few small Rubellite fragments.

-Tom


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