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GeneralHydroplumbite - opinions

30th Apr 2018 20:17 UTCTom Mortimer Expert

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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

Tom - I'd go with cerussite or hydrocerussite, although something like leadhillite or shannonite is possible - I would not trust the C and Al signals without proper calibration and comparison to internal references, analyzed under the same conditions on the same machine.

1st May 2018 16:33 UTCTom Mortimer Expert

Jeff, thank you for your suggestion. Following up, on a glass plate I pushed a small grain of this white mineral into a drop of muriatic and viewed under my scope. No fizz. As a method verification, I pushed a grain of a Flux Mine, AZ, cerussite into the drop. Lots of fizz action. So I conclude this is not cerussite, or hydrocerussite.

1st May 2018 16:49 UTCReiner Mielke Expert

I think you would have to prove that there is no S to rule out anglesite as that is far more likely than hydroplumbite.

1st May 2018 19:11 UTCUwe Kolitsch Manager

And don't forget that "hydroplumbite" has the status "questionable."

(Mindat had it also as "approved", but it's not on the latest IMA list -> fixed.)
 
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