We use cookies to show content based on your preferences. If you continue to browse you accept their use and installation. More information. >

FMF - Friends of Minerals Forum, discussion and message board
The place to share your mineralogical experiences

FMF English Forum is moderated by John S. White and Peter Megaw
 

Spanish message board






Newest topics and users posts
18 Aug-20:29:26 Re: mineral id help. (Robson Vieira)
18 Aug-20:28:11 Re: mineral id help. (Robson Vieira)
18 Aug-20:23:32 Re: mineral id help. (Robson Vieira)
18 Aug-20:03:09 Question about fluorite on quartz (Protium)
18 Aug-19:41:05 Re: breakfast with minerals - podcast discussion - episode 02 (Bluecapproductions)
18 Aug-17:38:21 Re: mineral id help. (Justin Hickok)
18 Aug-17:34:53 Re: abrasives repairing polishing crystals (Marco Campos-venuti)
18 Aug-17:16:07 Re: we celebrate the 12th anniversary of the beginning of fmf! (Fiebre Verde)
18 Aug-17:07:55 Re: mineral id help. (Bob Harman)
18 Aug-17:02:03 Re: mineral id help. (John Betts)
18 Aug-16:57:00 Re: mineral id help. (Justin Hickok)
18 Aug-16:49:58 Re: mineral id help. (Nick_g)
18 Aug-16:49:58 Re: mineral id help. (Tom Tucker)
18 Aug-16:22:06 Re: could anyone identify this stone? (Tom Tucker)
18 Aug-16:18:04 Mineral id help. (Robson Vieira)
18 Aug-16:11:23 Re: what is this ? (Paulmccabe1188)
18 Aug-15:59:32 Re: what is this ? (Justin Hickok)
18 Aug-15:46:24 Re: could anyone identify this stone? (Justin Hickok)
18 Aug-15:40:22 Re: pyrite? (Justin Hickok)
18 Aug-15:19:14 Re: pyrite? (Justin Hickok)
18 Aug-12:40:36 Re: pyrite? (Kevin Schofield)
18 Aug-12:18:57 Re: micro photos of inclusions in quartz (Zbhjzm)
18 Aug-12:09:50 Re: what is this ? (Kevin Schofield)
18 Aug-11:28:34 Re: could anyone identify this stone? (Procol)
18 Aug-11:22:43 Re: micro photos of inclusions in quartz (Riccardo Modanesi)

For lists of newest topics and postings click here


RSS RSS

View unanswered posts

Why and how to register

Index Index
 FAQFAQ RegisterRegister  Log inLog in
 {Forgotten your password?}Forgotten your password?  

Like
44940


The time now is Aug 19, 2018 03:09

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
Is this bournonite from Herodsfoot or from Harz??
  
  Index -> What is it? - Where is it from?
Like
3


View previous topic :: View next topic  
Author Message

jfc035




Joined: 14 Jul 2015
Posts: 22
Location: Rennes

View user's profile

Send private message

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:  856 Time(s)

01459a.jpg



01459b.jpg
 Mineral: Bournonite
 Description:
Herodsfoot, UK?
12 x 10 x 3 cm
 Viewed:  855 Time(s)

01459b.jpg


Back to top
Reply to topic Reply with quote
Like
1
   

Andreas Gerstenberg




Joined: 04 Mar 2010
Posts: 335
Location: Chemnitz


Access to the FMF Gallery title=

View user's profile

Send private message

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...

Best regards
Andreas
Back to top
Reply to topic Reply with quote
Like
1
   

jfc035




Joined: 14 Jul 2015
Posts: 22
Location: Rennes

View user's profile

Send private message

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
Back to top
Reply to topic Reply with quote
Like
1
   
Display posts from previous:   
   Index -> What is it? - Where is it from?   All times are GMT - 5 Hours
Page 1 of 1
    

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


All pictures, text, design © Forum FMF 2006-2018


Powered by FMF