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GeneralAllanite-(Ce)- Best minerals

23rd Jul 2015 12:48 UTCOlav Revheim Manager

I have added more information to the article started by Rock Currier, and the first draft of this mineral is now done. Please see

http://www.mindat.org/mesg-66-137477.html

Any additional information, suggestions for additional localities or corrections to the text will be highly appreciated.

Olav

23rd Jul 2015 19:37 UTCRob Woodside 🌟 Manager

Wonderful article!!! Thanks so much!!!

24th Jul 2015 02:13 UTCTony Albini

The person who discovered numerous, good quality allanite crystals at the Linkpot RR cut in East Hampton, CT was my mentor the late Richard Schooner.

24th Jul 2015 07:48 UTCOlav Revheim Manager

Rob,

Thank you very much for your kind words and continuous encouragement :-)

Tony,

Thank you for the information. The Linkpot Cut seems in deed to have produced some good allanites. It is mentioned on the locality page that the Richard Schooner discovered the locality, and I have included him as the discoverer of the locality in the text. I'd be happy to include any details on his discovery or any stories related to collecting at the site.

Olav

24th Jul 2015 16:30 UTCHenry Barwood

Wonderful article. There are interesting allanites from the Arkansas syenites as well. They have really not made it into the literature yet and need extensive work on the exact species (ferri v/s ferro and REE content), but they are magnificently crystallized micros.

24th Jul 2015 17:41 UTCTony Albini

Hi Olav,

Richard Schooner visited the Linkpot RR cut numerous times. He took me there years ago. The site is now a hiking trail, no collecting allowed and the best boulders with allanite are buried under a house's front yard! This cut was blasted for the Airline railroad, at that time the fastest route from New York City to Boston, MA. Richard told me he found the best allanites and other numerous species dumped in a swamp just before the cut on the left side of the cut. In the cut itself, the right side was more productive. There was red fluorite there and helvite among the other numerous species, also bastnaesite crystals (sic) with pyrite xls.

Tony

24th Jul 2015 18:05 UTCTony Albini

Hi Olav,

I forgot to mention that a lot of information about this site was in Richard Schooner's 1980 unpublished manuscript titled

Mineralogy of the Central Connecticut Area.

Tony

27th Jul 2015 08:27 UTCOlav Revheim Manager

Henry,

Thank you for your kind words. I am aware of the Arkansas allanites. I believe they where discussed in the mindat message board some time ago. Unfortunately, there are only two photos of allanites from Arkansas, and they are not very good. It might still be a good idea to include allanite from the Arkansas syenites to the article just to highlight that they should be investigated further. I would appreciate some help in selecting the best locality(ies) to include in the article, and any additional information you may have.

Olav

27th Jul 2015 08:27 UTCOlav Revheim Manager

Thank you Tony!

I will add your input to the article.

Olav

27th Jul 2015 12:31 UTCHenry Barwood

Hi Olav,

I have lots of images of the allanites from the Arkansas syenite, but the problem I have is that they are mostly not properly identified. I have some SEM/EDS data on them that suggests they are dominantly ferriallanite-(Ce), but most specimens are undetermined at this point. I'll see what I can dig up for you.

27th Jul 2015 19:43 UTCOlav Revheim Manager

Hi Henry,

I'd appreciate any information that you may have.

Thank you

Olav

30th Jul 2015 03:22 UTCRock Currier Expert

Excellent job. I really liked the reference section at the bottom and the Revision History section as well.

30th Jul 2015 07:49 UTCOlav Revheim Manager

Thank you Rock.

I like the reference section also, most of all that almost all of the references are available as pdf's on the internet. The wealth of information available for free and for all is amazing

Olav

31st Jul 2015 23:20 UTCRalph S Bottrill 🌟 Manager

Excellent article Olav, Lots of useful information.

But you are setting a high standard for the rest of us!

Nice to have a detailed reference list.

Perhaps a summary of other members of the allanite subgroup at the start would be useful?

With Trimouns it may be good to mention the the pale colored crystals may be more likely dissakisite-(Ce), as Pavel has found?

1st Aug 2015 07:57 UTCOlav Revheim Manager

Thank you Ralph!

It is a good idea to include a list of all the allanite minerals in the article. I am planning on an "epidote group" article tying the individual articles together, but I have a few more minerals to do first.

I will certainly add dissakisite-(Ce) in the header for the Trimouns entry. Ideally, I would like to see more analyses on this material, and Phillipe de Persevals thesis should contain some microprobe results. He has considered this mineral allanite-(Ce) in all the articles he has co-authored, but his thesis was written before dissakisite-(Ce) was approved. :-S

Olav

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