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GeneralHydroplumbite - opinions
30th Apr 2018 20:17 UTCTom Mortimer Expert
A candidate hydroplumbite from a galena - quartz vein, Bow, NH, USA collected 2016. Field of view: 16 mm. A soft white crust on galena. EDS of a carbon tape mounted grain shows only Pb and O, with a bit of Al. Uncertain if the aluminum is intrinsic to the mineral or just an impurity. On an APFU basis calculated from the atomic percents, the Pb and Al are about equal. Hydroplumbite appears to be quite rare. There are no hydroplumbite photos on mindat.
Some additional thoughts: The EDS Pb line may be hiding a sulfur line, giving rise to the possibility of powdered anglesite. The EDS instrument has very good light element response, including carbon. There is a tiny carbon bump in the plot, which, if real, might suggest powdered cerussite. Cerussite crystals to several mm are common with the galena at this locality.
Opinions from the mindat community appreciated.
Tom Mortimer
30th Apr 2018 20:55 UTCJeff Weissman Expert
1st May 2018 16:33 UTCTom Mortimer Expert
1st May 2018 16:49 UTCReiner Mielke Expert
1st May 2018 19:11 UTCUwe Kolitsch Manager
(Mindat had it also as "approved", but it's not on the latest IMA list -> fixed.)
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © 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 27, 2024 05:13:55