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
16 Aug-16:43:26 Re: pyrite? (Justin Hickok)
16 Aug-15:25:31 Re: collection of michael shaw (Crosstimber)
16 Aug-13:25:44 Re: tremolite-actinolite skarn with diverse crystals (Kara)
16 Aug-12:07:05 Re: tremolite-actinolite skarn with diverse crystals (Susan Robinson)
16 Aug-10:11:47 Re: tremolite-actinolite skarn with diverse crystals (Pete Richards)
16 Aug-09:46:33 Re: tremolite-actinolite skarn with diverse crystals (Bob Carnein)
16 Aug-08:32:19 Re: tremolite-actinolite skarn with diverse crystals (Kevin Schofield)
16 Aug-08:09:57 Re: tremolite-actinolite skarn with diverse crystals (Kara)
16 Aug-08:00:31 Re: tremolite-actinolite skarn with diverse crystals (Kara)
16 Aug-07:52:26 Tremolite-actinolite skarn with diverse crystals (Kara)
16 Aug-07:20:15 Re: pyrite? (Bob Morgan)
16 Aug-00:30:22 Re: pyrite? (Mathias)
15 Aug-20:38:00 Re: pyrite? (Justin Hickok)
15 Aug-19:54:56 Re: pyrite? (Justin Hickok)
15 Aug-19:43:57 Re: pyrite? (Bob Harman)
15 Aug-19:43:20 Re: pyrite? (Justin Hickok)
15 Aug-19:04:03 Pyrite? (Justin Hickok)
15 Aug-15:43:41 Re: enargite triplets (Justin Hickok)
15 Aug-11:31:07 Re: funny breccia (Kara)
15 Aug-09:21:52 Re: funny breccia (Kevin Schofield)
15 Aug-09:05:37 Re: enargite triplets (Bob Carnein)
15 Aug-08:39:38 Re: enargite triplets (Pete Richards)
15 Aug-05:51:00 Re: weird face in quartz (Pierre Joubert)
15 Aug-05:16:59 "mysterious and changing tourmaline" by roger warin - (29) (Jordi Fabre)
15 Aug-04:02:37 Re: funny breccia (Kara)

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
44839


The time now is Aug 16, 2018 17:17

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
Heavy rock identify help
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
Like


View previous topic :: View next topic  
Author Message

convento




Joined: 18 Nov 2017
Posts: 1
Location: braga

View user's profile

Send private message

PostPosted: Nov 18, 2017 15:06    Post subject: Heavy rock identify help  

hello, bring this rock from a mountain in north portugal.liked it because of the colours, diferent from the others near it.
Just curious to know what is it, as i do not understand nothing from rocks and minerals. so any help would be good, as it's my first rock. thank you!



DSC01485.JPG
 Description:
Braga
60 cms
 Viewed:  917 Time(s)

DSC01485.JPG



DSC01486.JPG
 Description:
Braga
60 cms
 Viewed:  926 Time(s)

DSC01486.JPG



DSC01487.JPG
 Description:
 Viewed:  923 Time(s)

DSC01487.JPG



DSC01488.JPG
 Description:
 Viewed:  927 Time(s)

DSC01488.JPG



DSC01489.JPG
 Description:
Braga
60 cms
 Viewed:  933 Time(s)

DSC01489.JPG



DSC01490.JPG
 Description:
 Viewed:  934 Time(s)

DSC01490.JPG


Back to top
Reply to topic Reply with quote
Like
   

Matt_Zukowski
Site Admin



Joined: 10 Apr 2009
Posts: 604
Location: Alaska


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 18, 2017 16:01    Post subject: Re: Heavy rock identify help  

It looks like some sort of cryptocrystalline quartz, but you don't really know unless you do some tests. You can find information about tests you might do here: "What is this? / Where is it from?"

I think the things people would most like to know to help you are:

1) Does it fizz? Carbonate rocks fizz when you put a dilute acid on them as the reaction of an acid with a carbonate produces CO2 gas. Dilute (10%) hydrochloric acid works best for a fizz test but even a weaker acid like vinegar can work - for vinegar it is best if you grind up the rock into a powder and put vinegar, especially heated vinegar, on the powder.

2) How hard is it? Minerals differ in their hardness so knowing what the hardness is a of particular specimen can help identify it. Look at the link cited above for info on hardness testing but basically you try to scratch your unknown with things of various hardness - things that scratch the unknown are harder than the unknown and things that are less hard than the unknown are scratched *by* the unknown.

3) What kind of cleavage does it have? With something like this i would like to break it open to see how it fractures. Fracture patterns can have some diagnostic value.
Back to top
Reply to topic Reply with quote
Like
   
Display posts from previous:   
   Index -> FOR BEGINNERS: 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