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

4th Jan 2016 19:51 UTCRichard Gunter Expert

Beryl, Bismuthinite

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

Is there any data to indicate this is Bismuthinite? My discussions with the Tanco and U. of M. people indicated that most of these elongate crystals that were originally assumed to be Bismuthinite are an intergrowth of Gladite/Pekoite.

4th Jan 2016 20:06 UTCReiner Mielke Expert

I hope you are right because I have a lot of it and it was sold to me as bismuthinite. Much prefer gladite/pekoite. Will have to get a sample analyzed. I did do EDS on what looked like a pseudomorph of the bismuthinite and it turned out to be native bismuth with no trace of cu so I didn't question the bismuthinite ID.

4th Jan 2016 21:08 UTCRichard Gunter Expert

Hi Reiner:

That is what I was told and Cerny et al did a lot of analyses. If you want to see what the Gladite/Pekoite intergrowth looks like there is a backscatter image in the Canadian Mineralogist article on the Tanco sulphides. If you have an earlier paper copy of the article the image should be clearer that the rather blurred example from the net.

5th Jan 2016 14:35 UTCReiner Mielke Expert

Hello Richard,

The sulphide article http://rruff.info/doclib/cm/vol16/CM16_625.pdf description of gladite-pekoite does not agree with what I have. The samples they found came form a rock with no beryl and with chalcopyrite. My material has beryl and no chalcopyrite. I will test my sample for Cu today, if there is no Cu present then it cannot be gladite.

5th Jan 2016 15:38 UTCRichard Gunter Expert

Hi Reiner:

The Cu test would do it. Most of the sulphides I have seen do not have beryl but are late-stage phases with albite. Did your sample come from the "Beryl Stop"?

5th Jan 2016 15:51 UTCReiner Mielke Expert

No I got it from David Joyce, no idea where he got it.

6th Jan 2016 00:18 UTCReiner Mielke Expert

The test for Cu was negative and the material reacted in Nitric acid just like typical bismuthinite from Cobalt, Ontario does. I'm calling it bismuthinite.

6th Jan 2016 00:59 UTCDavid K. Joyce Expert

All,

I was given it by a geologist at the mine and, if he specified where it came from, I do not recall.

Richard, did you mean the area they referred to( when I was frequenting the mine) as "the Beryl Pit"?

My analysis indicated bismuthinite. We live in hope!

David KJ

6th Jan 2016 15:43 UTCRichard Gunter Expert

Hi David;

Yes I have heard it referred to as either the Beryl Pit or the Beryl Stop. Tanco would put out maps of the mine for major tours and would have it as a tour stop. I was at the stop a couple of times but instead of Beryl I found a good Titanowodginite. I have a couple of stope maps for the mine but they are a bit large for scanning. I never saw much in the way of sulphides when I was at the Beryl stop so Bismuthinite with Beryl was new to me.

6th Jan 2016 17:24 UTCDavid K. Joyce Expert

The "Beryl Pit" is actually the type locality for titanowodginite at the mine. I have seen lots of titanowodginite and beryl from that area but not sulphide. It may have occurred at one time in the mining sequence. I'm always surprised at that place!

David K Joyce

6th Jan 2016 17:38 UTCRichard Gunter Expert

Hi David;

I collected my posted Titanowodginite several years before it was characterized; it was just unusual Tantalite then. Those tours were fun but the best part was watching the surprise on Peter Vanstone's face when Tanco threw something new at him. We hit the alteration zone that produced the posted Cesium Analcime and Lithiophosphate-Dorfmanite during one of the trips and he was really surprised. Peter Cerny was out the next day to take samples.

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