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Is this bournonite from Herodsfoot or from Harz??
  
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jfc035




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PostPosted: Jun 02, 2018 10:51    Post subject: Is this bournonite from Herodsfoot or from Harz??  

Hi
I recently purchased this bournonite specimen; it is from the Charles Noll collection (so likely a specimen he acquired in between 1940-70) and said to be from Harz. I was doubtful of the Harz origin before purchasing it (it is not from Neudorf), but curious, as it does not look like bournonite from South America or Romania (mostly because of the pseudomorphs mentioned above).
Actually, in many places the quartz is replacing thin platy crystals of what were most likely barite. So this reminds to Herodsfoot where those quartz a. barite pseudomorphs are ubiquitous. Yet the bournonite crystals does not figure the "usual" cogwheel twinning often seen at this UK mine. However, all bournonite from Herodsfoot do not necessarily show such cyclic twinning....
Apart from drusy quartz and bournonite, the specimen contains a tiny bit of chalcopyrite (covering some of the bournonite crystals)
so, has anyone a clue if this could be indeed a Herodsfoot specimen, or rather from another locality(in Harz??)
thanks
Jean-François



01459a.jpg
 Mineral: Bournonite
 Description:
Herodsfoot, UK?
12 x 10 x 3 cm
 Viewed:  986 Time(s)

01459a.jpg



01459b.jpg
 Mineral: Bournonite
 Description:
Herodsfoot, UK?
12 x 10 x 3 cm
 Viewed:  986 Time(s)

01459b.jpg


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Andreas Gerstenberg




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PostPosted: Jun 03, 2018 02:36    Post subject: Re: Is this bournonite from Herodsfoot or from Harz??  

Hi,

this is, in my opinion, a Herodsfoot piece. These druzy epimorphs are quite typical. You never see that on Neudorf specimens (so you don´t at any Harz locality). I´ve seen a similar one labelled as "Bräunsdorf, Saxony". That was an English one as well...

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Andreas
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jfc035




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PostPosted: Jun 03, 2018 04:03    Post subject: Re: Is this bournonite from Herodsfoot or from Harz??  

Thanks Andreas
I just received also a feedback from Steve Rust who votes for Herodsfoot as well.
Best regards
jf
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