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3961
LocalitiesPassaic pit (Marshall Mine; Passaic Mine), Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA
28th Apr 2011 21:21 UTCHarold Moritz ๐ Expert
Thanks
Harold Moritz
29th Apr 2011 01:24 UTCGary Moldovany
Please forgive my ignorance. I have collected samples of Hendricksite from both localities. I have found whole crystals and crystal groups at Sterling Hill. Gary
29th Apr 2011 17:14 UTCUwe Kolitsch Manager
Not really - the Zn peak is too small and the Mg peak is too high (was the spectrum quantified?).
29th Apr 2011 22:18 UTCGary Moldovany
29th Apr 2011 23:28 UTCDavid Bernstein Expert
The mineral IS on the species list for the Passaic Pit. Just sayin'. See ya tomorrow Fritz, and maybe you too, Gary.
30th Apr 2011 00:51 UTCModris Baum ๐ Expert
Dunn does say that "At Sterling Hill, hendricksite is less abundant, due in part to a locally higher concentration of Mg and Fe in silicates, relative to Franklin. Frondel and Einaudi (1968) reported hendricksite occuring on one specimen with andradite, rhodonite, franklinite, and calcite, and on another with calcite and franklinite".
So hendricksite should be on the Sterling Hill list. Whether it is abundant in the Passaic Pit (specifically) - or even found there - is another question.
30th Apr 2011 01:43 UTCPhilip Persson Expert
regards,
Philip
30th Apr 2011 02:24 UTCMark Heintzelman ๐ Expert
MRH
2nd May 2011 03:30 UTCHarold Moritz ๐ Expert
2nd May 2011 06:01 UTCModris Baum ๐ Expert
He really had no opinion on the matter. As he states in his monograph "The extant knowledge is drawn entirely from Frondel and Ito (1966) and Frondel and Einaudi (1968); the paragenesis has not been investigated by the writer." Pete suggested that these articles should be consulted to see if they have specific information on occurences from the "Passaic Pit" (specifically) vs "Sterling Hill" (generically).
The articles are "Hendricksite, a new species of mica", Am Min 51, 1107-1123 and ""Zinc-rich micas from Franklin, New Jersey", Am Min 53, 1752-1754. I don't have access to these.
I don't think there is any debate about the presence of hendricksite at "Sterling Hill" or the need for it to be on that list. But if the "Passaic Pit" is to be treated as an distinct sub-locality then this needs independent verification.
BTW - Since "biotite" is now a series name, I'm confused by what the term "biotite standard" means.
2nd May 2011 15:01 UTCHarold Moritz ๐ Expert
http://www.minsocam.org/ammin/AM51/AM51_1107.pdf
http://www.minsocam.org/ammin/AM53/AM53_1752.pdf
Looks like there is quite a variation in composition and my one sample analysis is apparently not enough of a database to characterize the abundant mica in the whole Passaic Pit.
2nd May 2011 15:21 UTCModris Baum ๐ Expert
2nd May 2011 15:26 UTCFred E. Davis
2nd May 2011 16:34 UTCVandall Thomas King Manager
Looking at the EDS pattern, your specimen looks like a ferroan phlogopite with a trace of zinc. The XRD has surprisingly broad peaks, but certainly looks like a mica. These data certainly don't agree well with the hendricksite end of the series, but as Uwe asked, "Were the peaks compared with a standard?" Even an unanalyzed Franklin hendricksite might be of help. The problem with EDS is that there is often the assumption that the peaks are "semi-quantitative", but the various elements are excited in different was depending on the operating volatages, condition of the counter, etc. Some labs do provide semi-quantitative EDS data, but it isn't known what the equipment used could deliver. Ordinarily, you would expect a higher peak for an element with larger atomic number and the zinc peak is probably disproportionately high relative to Mg. I am very glad to see that you used both XRD and EDS for your identification. One method gives you chemical information, one gives you structural information and you need to know BOTH to identify minerals with a high degree of certainty.
2nd May 2011 18:08 UTCHarold Moritz ๐ Expert
I have reworked the XRD plot and reviewed the data based on what I've learned in the last 6 years. My response would be:
"The EDS was acquired from a polished specimen, but was qualitative only. "
The work was done on the SEM at AMNH, but no quantitative data was taken. Paul Bartholomew & I only had an afternoon to run a bunch of specimens, so the time spent was not sufficient for quantitative work. The AMNH operator had not set it up for semi-quant work, either, so we were stuck with qualitative data.
"The XRD is somewhat suggestive of hendricksite, but certainly not conclusive."
I replotted the XRD to make it a little more clear (what you have is my "old" method). The closest match for biotite uses "biotite-1M" data from MDI (the Materials Data Inc. database). The closest match for hendricksite comes from the same database. Given the difficulty in powdering a sheet silicate by hand, I would not be surprised by peak height and width issues.
The full range plot shows the right three peaks aligned better with hendricksite, and the middle of those for hendricksite alone is good position wise, but not so much for amplitude. The low d-spacing was crowded, so I expanded it in a second plot. Again, hendricksite has the edge, but is not definitive.
"There is not sufficient evidence in both EDS and XRD for a definitive call."
These are my thoughts today when revisiting the old data. It's just too close to call. Given the environment, I would lean toward hendricksite, but I wouldn't by the house on it. You are free to post any of my comments and the attached plot(s), or after your review we can discuss it further.
Fred
2nd May 2011 18:13 UTCChester S. Lemanski, Jr.
The first mining efforts here were for iron by mining the relic Fe-rich material in the center of the pit. This was later followed by the Zn mining of the hemimorphite. Thus, an Fe-rich, Zn-poor mineral suite is not unexpected.
I collected some of this black mica, in large crystals, a bit further north along the east vein. It certainly appears to be biotite but looks are deceiving. At Franklin much of the Hendricksite occurs in gangue within the ore body, often associated with Fe-garnet (andradite), and is a dark brown color. Of course, mica in the Franklin Marble, away from the ore bodies, is often Phlogopite.
2nd May 2011 19:16 UTCHarold Moritz ๐ Expert
2nd May 2011 20:52 UTCVandall Thomas King Manager
2nd May 2011 20:53 UTCJeff Weissman Expert
27th Nov 2011 21:34 UTCHarold Moritz ๐ Expert
Azurite is already on the page, and I just finished doing some micro-photos (attached) of all three of these minerals from a single small specimen of marble found in the Passaic Pit last April. Much of this material has turned up in recent years, its occurrence in the unaltered marble wall just outside the "mud zone" is consistent with the statement on page 270 of Dunn (1995) (citing Metsger, 1990) "A halo of copper mineralization surrounds the mud zone at a distance of 15 feet." The quote does not differentiate whether that observation was within the pit or within the subsurface mined portion of the mud zone, but Dunn (1995) only describes the presence of these 3 minerals (see mineral descriptions pages 530, 618, 622) within subsurface levels at SH, not within the pit. However the abundance of this assemblage from recent Passaic Pit collection obviously extends the occurrence to the surface exposures. Chet, I'm going to post the azurite now and the other minerals when you are OK with it.
Fritz
27th Nov 2011 22:55 UTCChester S. Lemanski, Jr.
No problem. Post whenever. We collected malachite there back inn the early 90's. It was altering out of primary sulfides in a veinlet in the marble.
28th Nov 2011 00:50 UTCHarold Moritz ๐ Expert
5th May 2012 16:16 UTCHarold Moritz ๐ Expert
Also attached is a specimen (3553) I picked up the same place that didnt have a label but I recognized its Passaic Pit origin because I bought another just like it that did have a label. On both specimen the mineral forms small spherical rosettes or radiating aggregates of tiny platy crystals, with bright broken surfaces and seems to match very well Dunn's description of chalcophanite. However, the labeled specimen says it is hetaerolite. I dont have a lot of experience with these older Mn oxides so would appreciate input on the species before posting. I will take a microphoto of the aggregates soon.
Thanks
5th May 2012 20:26 UTCHarold Moritz ๐ Expert
6th May 2012 02:02 UTCSteven Kuitems Expert
Steve.
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are ยฉ OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 24, 2024 09:03:49