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 Nov-17:20:59 Re: collection of benjamin carballo (Benj)
18 Nov-17:10:23 Re: collection of benjamin carballo (Benj)
18 Nov-16:26:23 The mizunaka collection - quartz (Am Mizunaka)
18 Nov-16:01:21 Re: heavy rock identify help (Matt_zukowski)
18 Nov-15:45:42 Re: mineral names in different languages and their meaning (Pete Modreski)
18 Nov-15:06:46 Heavy rock identify help (Convento)
18 Nov-14:30:51 Re: franjungle collection (Franjungle)
18 Nov-14:19:52 Questions about microcline (Josele)
18 Nov-14:06:19 Re: new generation for picture - ploum (Ploum)
18 Nov-11:46:25 Re: mineral names in different languages and their meaning (Alfredo)
18 Nov-09:22:47 Re: information about a rhodochrosite specimen (Matt_zukowski)
18 Nov-09:16:58 Re: information about a rhodochrosite specimen (Marco Campos-venuti)
18 Nov-08:58:29 Information about a rhodochrosite specimen (Charlotte)
18 Nov-06:31:45 Re: assistance in getting locality info for this mexican? orthoclase & amphibole speci (Marco Campos-venuti)
18 Nov-05:25:09 Re: assistance in getting locality info for this mexican? orthoclase & amphibole speci (John S. White)
18 Nov-04:34:09 Re: mineral names in different languages and their meaning (Tobi)
18 Nov-04:07:50 Re: mineral names in different languages and their meaning (Pierre Joubert)
18 Nov-02:51:54 Mineral names in different languages and their meaning (Tobi)
18 Nov-01:58:41 Re: assistance in getting locality info for this mexican? orthoclase & amphibole speci (Peter Lemkin)
18 Nov-01:28:43 Re: collection of michael shaw (Tobi)
18 Nov-01:21:40 Re: assistance in getting locality info for this mexican? orthoclase & amphibole speci (Tobi)
17 Nov-21:57:25 Re: micro photos of inclusions in quartz (Zbhjzm)
17 Nov-18:51:12 Re: need help to put a value on this 100lb pice of quartz i dug up 2 weeks ago (Jordi Fabre)
17 Nov-18:31:26 Need help to put a value on this 100lb pice of quartz i dug up 2 weeks ago (Grizzlyfrost)
17 Nov-18:23:37 Re: micro photos of inclusions in quartz (Ed Huskinson)

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
35346


The time now is Nov 18, 2017 20:26

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
Need help to identify a rock
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
Like
6


View previous topic :: View next topic  
Author Message

microboston




Joined: 05 Jul 2017
Posts: 2

View user's profile

Send private message

PostPosted: Jul 05, 2017 16:40    Post subject: Need help to identify a rock  

Hello,

While I was walking in a beach, I saw these 2 rocks and picked up. They are very beautiful. One has black, blue, purple and gold colors, other one is black and gold. I did a bit go ogling and they might be covellite? These are not very hard and easy to scratch them. Any help is appreciated.

Thank you

P.s. I found them at a beach in Massachusetts.
Back to top
Reply to topic Reply with quote
Like
   

Matt_Zukowski
Site Admin



Joined: 10 Apr 2009
Posts: 580
Location: Alaska


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jul 05, 2017 16:59    Post subject: Re: Need help to identify a rock  

Sorry but you need to give us more information before we can help you. Please read Asking: "What is this? / Where is it from?" and provide us with some basic information about the specimen as well as at least one sharp photograph.

In case you need even more help you can use this fine web page from Minsocam.org, the Mineralogical Society of America.
Back to top
Reply to topic Reply with quote
Like
   

microboston




Joined: 05 Jul 2017
Posts: 2

View user's profile

Send private message

PostPosted: Jul 05, 2017 17:51    Post subject: Re: Need help to identify a rock  



I'm sorry, for some reason files are not being attached. I will try again to upload pictures. Also have a video.

Thank you



2017-07-04 11.33.47.jpg
 Mineral: Covellite
 Dimensions: 5 cm
 Description:
 Viewed:  1368 Time(s)

2017-07-04 11.33.47.jpg


Back to top
Reply to topic Reply with quote
Like
   

Pete Modreski
Site Admin



Joined: 30 Jul 2007
Posts: 598
Location: Denver, Colorado


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jul 05, 2017 18:05    Post subject: Re: Need help to identify a rock  

I see from the video why you thought it might be covellite. But that would be pretty much unheard of, as a beach stone (especially in Massachusetts).

As per what Matt said, please do look at our identification guidelines under the site guide, though I suspect, you'll have a hard time getting any measurable/definitive properties. Try to make your best judgement as to... hardness, density compared to "average" rocks, etc.

Some of my thoughts/guesses: mafic (iron-rich) coarse-grained igneous rock with cleavage grains of iridescent pyroxene and/or labradorite feldspar; some kind of slag; silicon carbide (unlikely--it's very hard, wouldn't get rounded)...
Back to top
Reply to topic Reply with quote
Like
1
   

lluis




Joined: 17 Nov 2006
Posts: 552

View user's profile

Send private message

PostPosted: Jul 06, 2017 05:25    Post subject: Re: Need help to identify a rock  

Hi, Microboston, list

As said, without more info that being found in a beach, few could be said....

But, to me eyes, looks as a piece of man made silicium carbide (carborundum), let in beach and there abraded/tumbled to look as it looks now.
For a covellite, I am pretty sure it is not. Covellite is very soft, and a copper sulphide with water, oxygen and salt (being in a beach, plenty of all...), well, very quickly copper sulphate,or copper chloride, both extremely soluble in water, so, altered and gone.....

With best wishes

Lluís
Back to top
Reply to topic Reply with quote
Like
1
   

Pierre Joubert




Joined: 09 Mar 2012
Posts: 1370
Location: Western Cape


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jul 06, 2017 05:41    Post subject: Re: Need help to identify a rock  

'These are not very hard and easy to scratch them. '

Cannot be corundum. What about anthracite?

_________________
Pierre Joubert


'The tree of silence bears the fruit of peace. '
Back to top
Reply to topic Reply with quote
Like
2
   

Reinhardt van Vuuren




Joined: 10 Mar 2015
Posts: 55
Location: Port Elizabeth

View user's profile

Send private message

PostPosted: Jul 06, 2017 06:07    Post subject: Re: Need help to identify a rock  

is it relatively light in relation to its size? to me it looks like the pieces of coal that we find in the area close to our harbor probably from a ship?
Back to top
Reply to topic Reply with quote
Like
1
   

lluis




Joined: 17 Nov 2006
Posts: 552

View user's profile

Send private message

PostPosted: Jul 06, 2017 06:33    Post subject: Re: Need help to identify a rock  

Hi, All

I think that probably Pierre and Reinhardt are right.....

Test is easy.... Does it burns (well, get red and consume slowly when placed in a flame...)?

With best wishes

Lluís
Back to top
Reply to topic Reply with quote
Like
1
   
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 2006-2017


Powered by FMF