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
26 Apr-12:54:53 Re: agates in sicily? (Gagat Minerals)
26 Apr-12:25:54 Re: franjungle collection (Franjungle)
26 Apr-12:21:21 Re: collection of carles millan (Franjungle)
26 Apr-11:57:22 Re: collection of michael shaw (Crosstimber)
26 Apr-11:49:50 Re: agates in sicily (Riccardo Modanesi)
26 Apr-11:49:44 Re: is this a meteorite (Nova2000)
26 Apr-10:57:15 Re: is this a meteorite (Jordi Fabre)
26 Apr-10:11:26 Re: is this a meteorite (Peter Lemkin)
26 Apr-10:09:17 Re: is this a meteorite (Peter Megaw)
26 Apr-09:18:03 Re: is this a meteorite (Kushmeja)
26 Apr-09:04:57 Is this a meteorite? (Lone)
26 Apr-06:02:45 Re: collection of carles millan (Enrique Llorens)
26 Apr-02:52:04 Collection of carles millan - beryl and muscovite from pakistan (Carles Millan)
25 Apr-20:56:54 The mizunaka collection - rhodochrosite with pyrite (Am Mizunaka)
25 Apr-14:20:07 Re: new generation for picture - ploum (Ploum)
25 Apr-12:07:16 Re: agates in sicily (Alanbartlett)
25 Apr-11:53:31 Re: the mizunaka collection (Am Mizunaka)
25 Apr-11:35:15 Re: collection of michael shaw (Crosstimber)
25 Apr-11:16:01 Re: agates in sicily (Marco Campos-venuti)
25 Apr-11:09:18 Re: agates in sicily (James)
25 Apr-10:59:28 Re: agates in sicily (Alanbartlett)
25 Apr-10:52:28 Re: agates in sicily (James)
25 Apr-10:35:57 Re: how to start a new topic (Alanbartlett)
25 Apr-10:35:01 Agates in sicily? (Alanbartlett)
25 Apr-10:02:13 Re: how to start a new topic (James)

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
42147


The time now is Apr 26, 2018 18:14

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
What is it?
  
  Index -> What is it? - Where is it from?
Like
3


View previous topic :: View next topic  
Author Message

zar24




Joined: 15 Dec 2013
Posts: 7
Location: Iran

View user's profile

Send private message

PostPosted: Apr 16, 2018 08:59    Post subject: What is it?  

Hello every one!
When I was taking some photos, I had found somethings like Wart on rocks. What is this?



photo_2018-04-16_18-28-45.jpg
 Description:
 Viewed:  550 Time(s)

photo_2018-04-16_18-28-45.jpg


Back to top
Reply to topic Reply with quote
Like
   

Bob Harman




Joined: 06 Nov 2015
Posts: 320
Location: Indiana


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Apr 16, 2018 09:11    Post subject: Re: What is it?  

Based just on your photo and based on a guess that the photo is of a site in Iran, I would guess that it represents iron containing concretions (or nodules), more resistant than the surrounding rock, probably a limestone or similar. Note that there appears to be a bit of iron oxide staining in the immediate matrix area of the intact and former concretions. Also note how the resistant concretions stick out of the surrounding rock and there may also be a couple in the weeds on the ground. BOB
Back to top
Reply to topic Reply with quote
Like
   

alfredo
Site Admin



Joined: 30 Jan 2008
Posts: 690
Location: New York


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Apr 16, 2018 09:22    Post subject: Re: What is it?  

Perhaps those iron oxide concretions were originally pyrite nodules and they oxidized.
Back to top
Reply to topic Reply with quote
Like
1
   

zar24




Joined: 15 Dec 2013
Posts: 7
Location: Iran

View user's profile

Send private message

PostPosted: Apr 16, 2018 12:11    Post subject: Re: What is it?  

Thank you BOB!
Thank you Alfredo!
Back to top
Reply to topic Reply with quote
Like
1
   

Kevin Schofield




Joined: 05 Jan 2018
Posts: 24
Location: Houston TX

View user's profile

Send private message

PostPosted: Apr 17, 2018 15:39    Post subject: Re: What is it?  

Your host rock looks like a limestone, possibly "chalky" and your concretions have a reniform, spheroidal or "bubbly" appearance that looks very like the marcasite (FeS2, same as pyrite but with a different crystal structure and less stable) found n the chalks of Northern France and Southern/Southeastern England. The brown appearance is due to the fact they they have oxidised (rusted!), but if you break one open, if should have a radial crystal pattern emanating from the middle of each spheroid.
_________________
Veni, Vidi, Emi
Back to top
Reply to topic Reply with quote
Like
1
   

zar24




Joined: 15 Dec 2013
Posts: 7
Location: Iran

View user's profile

Send private message

PostPosted: Apr 22, 2018 10:01    Post subject: Re: What is it?  

Thank you Kevin!
Back to top
Reply to topic Reply with quote
Like
   
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