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UV MineralsRe: Welcome!

30th Jan 2016 19:48 UTCDon Saathoff Expert

Hello All, How many of you have collected willemite with NO fluorescence and from where?

Jolyon, thanks for this!!

Don S.

30th Jan 2016 21:28 UTCRob Woodside 🌟 Manager

I was very excited about a light blue Tsumeb xllized willemite, that I almost got until I heard it was door nail dead! Very few minerals are intrinsically fluorescent. It almost always takes EDS undetectable impurites to generate luminescence.

30th Jan 2016 21:36 UTCChester S. Lemanski, Jr.

Don,

I have a rather significant willemite from the Tuva Republic location (ex. Fersman Museum) that is totally dead. Other, smaller, and later pieces that I have from there are the typical bright green fluorescent.

30th Jan 2016 22:45 UTCDon Saathoff Expert

I wonder what the quencher is? Cu? Fe?

Don S.

30th Jan 2016 22:58 UTCJosé Zendrera 🌟 Manager

Could be just due to the absence of Mn

30th Jan 2016 23:29 UTCAxel Emmermann

I think you're spot on, José. No Mn2+ no fluorescence ;-)

Although I have this yet unproven gut feeling that some titanium may induce a off-white fluorescence ( [TiO6]8-?).

This willemite from Arizona clearly fluoresces greenish white (SW) and it does so without Mn2+...

Afwillite does that too, and sometimes phlogopite, tremolite.....

31st Jan 2016 07:52 UTCJoel Dyer

Yes, indeed, have non-fluorescent willemite from the Töysä locality. It's so intermixed with pyromorphite that visual separation without analyzing methods is very difficult. Apropos, both of these were new species for Finland, as far as I could find out.

I though there was already another thread about willemite not necessarily being fluorescent?

Cheers,

1st Feb 2016 01:18 UTCDon Saathoff Expert

Well, wet chemistry & blowpipe proved another non-fluorescent willemite. This one is from the Independence Lode in the Victorio district, Luna Co., NM.

Don S.

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