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
25 Jun-07:00:24 Re: hairlike gold inclusions in quartz?? (Zbhjzm)
25 Jun-05:57:40 Re: hairlike gold inclusions in quartz?? (Zbhjzm)
25 Jun-05:24:18 Re: hairlike gold inclusions in quartz?? (Duncan Miller)
25 Jun-03:42:14 Re: hairlike gold inclusions in quartz?? (Zbhjzm)
25 Jun-03:20:15 Re: specimen with white prehnite - any idea on this? (Tobi)
25 Jun-02:25:56 Re: hairlike gold inclusions in quartz?? (Duncan Miller)
25 Jun-01:42:13 Re: hairlike gold inclusions in quartz?? (Zbhjzm)
24 Jun-23:49:46 Re: hairlike gold inclusions in quartz?? (Peter Lemkin)
24 Jun-22:03:12 Re: hairlike gold inclusions in quartz?? (Zbhjzm)
24 Jun-17:30:40 Re: quartz comparison (Kevin Schofield)
24 Jun-16:38:37 Re: i’m new to rock collecting...can anyone help identify this? (Maine Gems)
24 Jun-14:33:16 Re: specimen with white prehnite - any idea on this? (Crosstimber)
24 Jun-13:04:52 Specimen with white prehnite - any idea on this? (Tobi)
24 Jun-12:23:55 Re: quartz collecting outings in south africa (Pierre Joubert)
24 Jun-11:25:41 Re: hairlike gold inclusions in quartz?? (Peter Lemkin)
24 Jun-11:20:41 Re: i’m new to rock collecting...can anyone help identify this? (Chris)
24 Jun-11:05:00 Quartz comparison (Maine Gems)
24 Jun-10:49:34 Second photo (Maine Gems)
24 Jun-10:48:56 Re: hairlike gold inclusions in quartz?? (Zbhjzm)
24 Jun-10:44:58 I’m new to rock collecting...can anyone help identify this? (Maine Gems)
24 Jun-08:25:41 Re: hairlike gold inclusions in quartz?? (Peter Lemkin)
24 Jun-00:00:57 Re: micro photos of inclusions in quartz (Zbhjzm)
23 Jun-20:23:24 Re: hairlike gold inclusions in quartz?? (Zbhjzm)
23 Jun-18:52:35 Re: faden quartz crystals - (26) (Harjo)
23 Jun-16:27:31 Re: hairlike gold inclusions in quartz?? (Pete Richards)

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
43547


The time now is Jun 25, 2018 10:46

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
Pyrite and marcasite intergrowths
  
  Index -> Micros & Macros - Images of Minerals
Like
4


View previous topic :: View next topic  
Author Message

Roger Warin




Joined: 23 Jan 2013
Posts: 848


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jul 03, 2017 13:33    Post subject: Pyrite and marcasite intergrowths  

Pyrite and marcasite intergrowths.

Pyrite microcrystals are attached to marcasite crystal in systematic orientations.
Pete Richards described intergrowths of pyrite and marcasite very similar to those observed on Moroccan specimens (The Mineralogical Record Vol. 26 March-April 1995).
On my specimen, marcasite is hidden by subsequent overgrowths of pyrite. The group resembles a fir tree.
Pete Richards says that the crystallization of pyrite is subsequent to that of marcasite, including epitactic growth of pyrite on marcasite. The pyrite forms bars. Richards's hypothesis which explains the geometric observations is that the pyrite is epitactic on an acicular marcasite crystal which is completely overgrown by the pyrite. For more information, see the Richards's article.
http://www.phy.mtu.edu/~jaszczak/SB734_05.pdf



078-Pyrite#3_R.jpg
 Mineral: Pyrite
 Locality:
Bou Nahas Mine, Oumjrane mining area, Alnif, Tarhbalt, Er Rachidia Province, Meknès-Tafilalet Region, Morocco
 Dimensions: 36 mm
 Description:
 Viewed:  2123 Time(s)

078-Pyrite#3_R.jpg



079-Pyrite_bar#2_R.jpg
 Mineral: Pyrite
 Locality:
Bou Nahas Mine, Oumjrane mining area, Alnif, Tarhbalt, Er Rachidia Province, Meknès-Tafilalet Region, Morocco
 Description:
 Viewed:  2114 Time(s)

079-Pyrite_bar#2_R.jpg



080-Pyrite_marcasite_A&B-1_R.jpg
 Mineral: Pyrite
 Locality:
Bou Nahas Mine, Oumjrane mining area, Alnif, Tarhbalt, Er Rachidia Province, Meknès-Tafilalet Region, Morocco
 Description:
 Viewed:  2134 Time(s)

080-Pyrite_marcasite_A&B-1_R.jpg


Back to top
Reply to topic Reply with quote
Like
4
   
Display posts from previous:   
   Index -> Micros & Macros - Images of Minerals   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