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PhotosTourmaline - Tanco Mine, Bernic Lake, Lac-du-Bonnet area, Manitoba, Canada

15th Aug 2014 15:24 UTCRichard Gunter Expert

06478100014960094576771.jpg
Tourmaline
Tanco Mine, Bernic Lake, Lac-du-Bonnet area, Manitoba, Canada
Copyright © Bill Morgenstern - Earth Moods
This may be Rossmanite as many of the entirely pink Tanco tourmaline crystals are. Has it been analyzed?

31st Aug 2017 22:01 UTCRichard Gunter Expert

I see no activity on this note. All of the non-Rossmanite tourmaline from Tanco are green.

1st Sep 2017 08:43 UTCUwe Kolitsch Manager

Could also be elbaite or fluorelbaite. Labelling it tourmaline is fine.

1st Sep 2017 15:35 UTCRichard Gunter Expert

Hi Uwe:


Tanco has had extensive testing of the tourmaline species so it has a lot more data than most localities. The Elbaite-Flourelbaite crystals occur in a different paragenesis and are green. Red tourmaline was found only once and it is Rossmanite. Without this amount of data you are correct and tourmaline is acceptable as a name.

1st Sep 2017 15:39 UTCUwe Kolitsch Manager

I see. Maybe it might be possible to find out if this specimen came from the same find of rossmanite.

I'll point the uploader to this thread.

2nd Feb 2018 13:59 UTCBill Morgenstern Expert

I was given this and a very much larger specimen in about 2004-05 when I was living in Fort Frances, Ontario. Both are absolutely pire and of high quality and I assumed them to be tourmaline. Testing would be very good, but where?

2nd Feb 2018 15:26 UTCRichard Gunter Expert

Hi Bill:


They are Tourmaline Group as Rossmanite is a member of the Tourmaline Group. If you are in the Winnipeg area you might ask at the U. of Manitoba as they will have data on these minerals.
 
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