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Identity HelpIdentification

2nd Jan 2017 11:59 UTCRichard Antony Bell

Hello there,

this is primarily a question for Frank de Wit regarding the Preiswerkite photos from Geisspfad Pass in Switzerland.


Frank, on your photos you mention Zoisite as being in association with the Preiswerkite. Is the Zoisite the colourless blades on the specimens, specifically on photo XA4-P1G


Thanks for your help


Kind Regards


Richard

2nd Jan 2017 19:07 UTCFrank de Wit Manager

Thanks for the question Richard. Happy that you're interested in this stuff. Short answer: yes, I assume so. I didn't have it analyzed.

The general association is pale greenish mica-like flakes (preiswerkite) inbetween the white to very light green nodules of (I assume) zoisite within the dark Al-pargasite matrix. The white rims of nodules should also be zoisite. Keusen's type locality is quite small. I was there twice (in 1986 and 2011) and I guestimate it at a ca.4 meter wide and 40 centimeter small vein. These (http://www.mindat.org/photo-407699.html / http://www.mindat.org/photo-407698.html) are typical nodules (the second one is rather large).

My photography "skills" are not good enough I'm afraid, and I can't re-photograph the specimen, because I don't have it anymore.

Cheers, Frank

2nd Jan 2017 23:14 UTCRichard Antony Bell

Hello Frank,


Thank you for your comment, it has enabled me to confirm what I thought the Preiswerkite was and the likelihood of the colorless blades being Zoisite.

Many thanks again


Richard
 
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