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Identity Helpwinchite-richterite?
26th May 2010 16:20 UTCReiner Mielke Expert
27th May 2010 08:48 UTCLefteris Rantos Expert
27th May 2010 15:20 UTCReiner Mielke Expert
27th May 2010 16:13 UTCJolyon Ralph Founder
I haven't done any research to look up analysis of these amphiboles - but it might be worth checking out gemmology publications as well as mineral publications for references to winchite in afghanistan.
Jolyon
27th May 2010 16:49 UTCReiner Mielke Expert
Thanks for the suggestion I have started a search. One interesting thing that came up right away was a paper in American Mineralogist ( http://www.minsocam.org/ammin/AM66/AM66_625.pdf ) that says that winchite from the type locality is not winchite rather Magnesio-arfedsonite or riebeckite! This reference is not in the Mindat database, maybe it should be?
However, it seems it was rediscovered at the type locality in 1986 (Min.Mag.V50, 173-175) but I don't have a copy of that paper. But it does raise the question as to where or not the photos of winchite from the type locality in Mindat are winchite or not. Can someone send me a digital copy of the Min.Mag. article?
27th May 2010 22:09 UTCCraig Mercer
28th May 2010 16:03 UTCReiner Mielke Expert
My concern is that if improperly identified photos are put up on mindat it will give credibility to other similiarly misidentified samples and result in a "snowball effect". I have a sample of the colorless Afghan "winchite" ( so labeled by the seller). It does look like some of the photos on Mindat, so (based on an inadequate knowledge of the type material), it would be reasonable for me to assume that the label is correct. I might even post a picture of my sample on Mindat calling it winchite which would give all the previous photos even more credibility. I am sure that other collectors do the same thing, so it is very important to be reasonably sure of the identity of photos posted on Mindat. By reasonably sure, I mean at least match the essential characteristics of the type material. Correct me if I'm wrong, but isn't the streak one of these characteristics?
28th May 2010 18:16 UTCRob Woodside 🌟 Manager
28th May 2010 19:51 UTCReiner Mielke Expert
29th May 2010 13:08 UTCRock Currier Expert
29th May 2010 14:07 UTCSteve Rust Manager
The amphiboles from the Isle of Skye epigranites are a real nightmare to assign to a specific species, and are probably imposable to do so. Many are zoned from ferrowinchite- ferroactinloite-ferroedenite-ferrorichterite-katphorite-riebeckite. I am in the process of writing an article on the miralitic epigranites of the Isle of Skye. I will probably lump these under the amphibole heading.
I hope you come up with a solution you can live with Reiner
All the best
Steve Rust
29th May 2010 17:09 UTCMassimo Russo (Maxim) Expert
Massimo
1st Jun 2010 17:10 UTCReiner Mielke Expert
1st Jun 2010 19:28 UTCRob Woodside 🌟 Manager
3rd Jun 2010 11:00 UTCLefteris Rantos Expert
Lefteris.
3rd Jun 2010 15:48 UTCRalph S Bottrill 🌟 Manager
Rob: winchite can theoretically be Fe-free, but should have abundant Al; I presume Mg was also abundant?
3rd Jun 2010 16:56 UTCRob Woodside 🌟 Manager
Si >> Al > Mg > Ca >> K > Na > Ti
So this might be a potassian winchite. At this point I think it hopeless to unambiguously assign any species to the amphiboles without single xl and WDS for that piece. Even then there could be mixed xls.
3rd Jun 2010 18:00 UTCReiner Mielke Expert
All you need now is one more from there, http://www.mindat.org/photo-310713.html, and you will have all your "bases" covered. Out of the three at least one will turn out correct.(:D
6th Jun 2010 13:31 UTCRalph S Bottrill 🌟 Manager
That analysis could be any of these three amphiboles; a microprobe analysis would tell.
7th Jun 2010 00:12 UTCRob Woodside 🌟 Manager
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Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: March 28, 2024 22:36:11