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Techniques for CollectorsDiscussion about Paragenesis

29th May 2013 20:16 UTCVandall Thomas King Manager

I just put a downloadable pdf on my website about Paragenesis of rhodonite - axinite-(Mn) veins from Franklin, NJ. I thought it might be a useful example of thinking about what paragenesis means. http://www.newryqs.com/Franklin%20Mineral%20Vein.pdf

29th May 2013 21:44 UTCRichard Gunter Expert

Hi Van:


That looks like a very good article and will help a great deal in sorting these samples out. One question I had was with my sample of an Axinite-Mn vein where there is Hancockite at the border between the Axinite-Mn and the Franklinite ore. As you can see the boundary of the Axinite-Mn vein is not sharp but gradational and very irregular. The Franklinite associated with this vein is also mantled by Andradite. Is this type of paragenesis common at Franklin?


Richard Gunter

29th May 2013 23:31 UTCVandall Thomas King Manager

Very interesting, but this is not from the vein assemblage. This is a replacement assemblage. As noted at the end of the article, I mentioned I will add hancockite and several other species to the photos of the vein assemblage. I'm waiting for some microscope lenses to get some good shots of the hancockite and am waiting for analytical results of a possible atacamite, etc.

30th May 2013 00:04 UTCRichard Gunter Expert

Hi Van:


I look forward to seeing your pictures. I do not see anything in the sample that would resemble Atacamite but some of the non-fluorescent phases in the cavities look like Cahnite. In this sample the matrix contains orange fluorescing Clinohedrite and there are several groups of more or less altered Hendricksite. The Hancockite does not form euhedral crystals in this sample, as it seems to be too early in the paragenesis. My samples from the Charlesite paragenesis contain both euhedral Hancockite and the pseudo-hexagonal Ganophyllite you mention. I think it is also a replacement paragenesis.


Richard Gunter
 
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