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


Spanish message board






Newest topics and users posts
18 Mar-08:12:52 Green seam. Looks like it in a state of decay. (Ning)
18 Mar-06:47:13 Mineralogy & museums 10 - cardiff - 12th-13th august 2024 (Roy Starkey)
18 Mar-02:50:32 Re: collection from dany mabillard (Dany Mabillard)
17 Mar-01:57:58 Re: collection of volkmar stingl (Volkmar Stingl)
15 Mar-14:27:47 Re: collection of philippe durand (Philippe Durand)
15 Mar-13:49:04 Re: collection of firmo espinar (Firmo Espinar)
15 Mar-09:18:42 Re: collection of michael shaw (Michael Shaw)
15 Mar-03:45:43 The mizunaka collection - rhodochrosite (Am Mizunaka)
14 Mar-21:29:31 Re: monthly mineral chronicles, mineral guides and more... (Crocoite)
14 Mar-14:47:27 Re: collection of philippe durand (Jordi Fabre)
14 Mar-13:56:01 Re: collection of philippe durand (Philippe Durand)
14 Mar-11:24:43 Re: collection of philippe durand (Jordi Fabre)
14 Mar-08:55:22 Re: collection of michael shaw (Michael Shaw)
14 Mar-08:44:47 Re: the mim museum in beirut, lebanon (Mim Museum)
14 Mar-07:24:12 Re: collection of volkmar stingl (Volkmar Stingl)
14 Mar-02:30:15 The mizunaka collection - quartz (Am Mizunaka)
14 Mar-02:20:37 Re: collection of volkmar stingl (Tobi)
13 Mar-23:40:08 Re: collection of volkmar stingl (Volkmar Stingl)
13 Mar-14:22:58 Re: don lum collection (Don Lum)
13 Mar-14:02:43 Re: collection of philippe durand (Philippe Durand)
13 Mar-00:57:48 The mizunaka collection - quartz (Am Mizunaka)
12 Mar-07:36:06 Re: can you recommend a lab to analyse specimens (Luiz Oliveira)
11 Mar-16:19:18 Re: collection of philippe durand (Riccardo Modanesi)
11 Mar-15:18:26 Re: collection of philippe durand (Philippe Durand)
11 Mar-15:13:07 Re: collection of philippe durand (Philippe Durand)

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
111630


The time now is Mar 18, 2024 22:44

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
Some beautiful obsidian like rocks
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
Like
7


View previous topic :: View next topic  
Author Message

sprinklerdude




Joined: 19 Oct 2021
Posts: 3
Location: Upper Midwest USA

View user's profile

Send private message

PostPosted: Oct 20, 2021 08:23    Post subject: Some beautiful obsidian like rocks  

Greetings Internet forum users. Our attention is the most valuable commodity there is (in my opinion), thanks in advance for sharing yours with me.

I recently got these two pieces from a customer, they were used in landscaping.
I haven't been able to find pictures of anything like them.

I don't know much about geology but I work with the ground and have a pretty nice rock collection even including other obsidian but I have never seen anything like either of these.

The small one weighs about 20 lbs and the big one is over 50
The one I call "root beer' color lets some light through the brown and
so does the red one.
The red one has orange streaks and a few purple "flakes" here and there and some crystal formation on it too.

Both are glass-like, the big one is about 13" X 9".

I'd really like to know where they come from, I don't think they came from the same place and I didn't get any useful info from the guy I got them from.
I plan on displaying them indoors, I like rocks.



Obsidian rockies.jpg
 Description:
Unknown obsidian like stones
 Viewed:  4184 Time(s)

Obsidian rockies.jpg


Back to top
Reply to topic Reply with quote
Like
   

Matt_Zukowski
Site Admin



Joined: 10 Apr 2009
Posts: 707
Location: Alaska


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Oct 20, 2021 08:48    Post subject: Re: Some beautiful obsidian like rocks  

These are probably glass slag.
Back to top
Reply to topic Reply with quote
Like
3
   

sprinklerdude




Joined: 19 Oct 2021
Posts: 3
Location: Upper Midwest USA

View user's profile

Send private message

PostPosted: Oct 20, 2021 09:00    Post subject: Re: Some beautiful obsidian like rocks  

As in artificial? I wondered that because of the color. The red one has some crystal stuff on it.
looks like you could make some arrowheads with it either way in a pinch.
Back to top
Reply to topic Reply with quote
Like
   

James Catmur
Site Admin



Joined: 14 Sep 2006
Posts: 1336
Location: Cambridge


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Oct 20, 2021 09:47    Post subject: Re: Some beautiful obsidian like rocks  

I tend to agree, glass slag of some type.
Back to top
Reply to topic Reply with quote
Like
2
   

R Saunders




Joined: 28 Jul 2018
Posts: 126
Location: Michigan


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Oct 20, 2021 10:24    Post subject: Re: Some beautiful obsidian like rocks  

Many USA glass factories would dispose of the left over glass in the furnaces when they changed colors or closed up shop, or had to repair a cracked furnace. I have seen especially Fenton glass slag/left over glass for sale at rock shops.
Back to top
Reply to topic Reply with quote
Like
1
   

SteveB




Joined: 12 Oct 2015
Posts: 235
Location: Canberra

View user's profile

Send private message

PostPosted: Oct 20, 2021 15:16    Post subject: Re: Some beautiful obsidian like rocks  

Waste glass for sure, not even stabilised, would not be able to make arrowheads by knapping.
Back to top
Reply to topic Reply with quote
Like
   

sprinklerdude




Joined: 19 Oct 2021
Posts: 3
Location: Upper Midwest USA

View user's profile

Send private message

PostPosted: Oct 21, 2021 07:00    Post subject: Re: Some beautiful obsidian like rocks  

Thanks, that's got to be what it is, I looked up slag glass and it checks out, it's even got bubbles in the red one, I learned that another piece that I have is slag glass too and not obsidian, it's just black/dark brown and baseball sized but has bubbles.
I will stick around here and learn more about rocks for sure and maybe even post something else.
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 2006-2024


Powered by FMF