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GeneralGreen obsidian

8th Feb 2020 08:52 GMTVicki Ribal

Hello, I’m not sure how I found you but i didn’t and I’m glad I did. I’m a newbie I’ll apologize in case I post incorrectly. I a novice rock hound I think I have a very nice collection. Subjective? I want y’all to see a green obsidian specimen one in my collection.

8th Feb 2020 13:32 GMTKevin Hean

Hi Vicki
Do you know where it is from ?

19th Feb 2020 22:02 GMTVicki Ribal

I’m sorry I don’t. I live in Oregon I know is from my state. Did you like it?

19th Feb 2020 23:04 GMTPaul Brandes Manager

Welcome to Mindat, Vicki!

Could you please provide some more photos from different angles. I'm not completely convinced it is obsidian, but some additional pics may help.

25th Feb 2020 23:14 GMTVicki Ribal

This is a different specimen. I dropped my larger specimen on my wood floors and broke:( thank you for all of your knowledge I’m learning. I should’ve posted different for that I apologize 

20th Feb 2020 20:06 GMTMatt Ciranni

I have heard of green obsidian being found in an undisclosed area north of Burns, Oregon  (Harney county) but it is allegedly quite rare, and most of the places where it was found are on private land where it's hard to get at it.  The pieces of it I have seen do look like the photo- same olive-green color. 

21st Feb 2020 22:05 GMTVicki Ribal

Here are more pics. There not all that great I’ll take more outside when I get home.

21st Feb 2020 22:06 GMTVicki Ribal

I’ll try more pics

21st Feb 2020 22:08 GMTVicki Ribal

Wrong pic. Let me apologize for not knowing how to navigate this website. 

21st Feb 2020 22:09 GMTVicki Ribal


21st Feb 2020 23:49 GMTMatthew Droppleman

I didn’t even know obsidian could be green. Nice to know!

22nd Feb 2020 00:39 GMTPaul Brandes Manager

Thanks Vicki!

I wanted to have some additional photos to see if there were any bubbles in your specimen, a tell-tale sign of slag. I don't see any bubbles, so I would say your obsidian is legit.

22nd Feb 2020 21:07 GMTVicki Ribal

Natural sunlight

22nd Feb 2020 21:09 GMTVicki Ribal

Natural sunlight no filters no editing of photos! Thank y’all for looking a part of my larger collection. No air bubbles 

22nd Feb 2020 22:25 GMTcascaillou

There can be bubbles in both artificial and natural glass (such as obsidian, tektites, impactites), but both artificial and natural glass can also be free of any bubbles.

22nd Feb 2020 23:43 GMTPaul Brandes Manager

True, but they are much more common in slag than obsidian. And, if there are bubbles in obsidian, they are tiny and typically align themselves in layers as the flow cooled.
If there are any in these specimens, I just don't see them.

25th Feb 2020 23:03 GMTVicki Ribal

Here another piece I have. I’m holding in my hand outside on a sunny very nice day. 

22nd Feb 2020 21:42 GMTKevin Conroy Manager

From the natural sunlight photos the pieces look more like chert, or maybe jasper.

22nd Feb 2020 23:44 GMTPaul Brandes Manager

Another case where actually holding these in your hand would answer a lot of questions..... ;-)

25th Feb 2020 23:17 GMTVicki Ribal

This specimen I’m holding I’m outside natural sunlight on a very nice Oregon day. Thank you i appreciate your knowledge I’m still learning. I apologize if I posted wrong I should’ve asked for identification 

27th Feb 2020 03:04 GMTVicki Ribal

Thank you for your thoughts. I have a lot of jasper. Being outside in Oregon if you look down you find a piece of jasper. Yellow my fav. My question is does jasper break when you drop it? 
 My larger whatever it is, I dropped it broke in half. When jasper breaks is it sharp? The specimens I’m taking to Roxy Ann gem and mineral show to have the experts ID. Southern Oregon university geology professors. There terrific. v

23rd Feb 2020 02:14 GMTDavid Carter

Vicki Ribal  ✉️

Hello, I’m not sure how I found you but i didn’t and I’m glad I did. I’m a newbie I’ll apologize in case I post incorrectly. I a novice rock hound I think I have a very nice collection. Subjective? I want y’all to see a green obsidian specimen one in my collection.

To be fair, Vicki didn’t initially seem to be asking for an ID of the specimen when first posted, but was merely presenting it for aesthetic recognition. Vicki personally posited that it was green Obsidian and later on in the discussion stated that it wasn’t known exactly where it was from, but it was apparently from Oregon.

It would be interesting to know from Vicki why it’s believed it is green Obsidian (as opposed to something else) and also why Vicki is certain it is from Oregon? I’m assuming the specimen wasn’t collected personally because Vicki didn’t know the locality it’s from, so is this all just information Vicki has been told by the person it was obtained it from? In which case, that information could well be very wrong!

The different and varying degrees of lighting certainly don’t help to make a carefully considered identification any easier!

As the initial poster stated, the personal belief is that the collection they have is nice and they are content with it so, at the end of the day, that’s what really counts ... isn’t it?

23rd Feb 2020 03:09 GMTJim Allen

Green obsidian is known to occur near Burns, Oregon. The pieces I've seen look very much like Vicki's. It's opaque with distinct flow lines, and kind of a grayish green--much like the color of a U.S. Forest Service vehicle. It is very different from the clear, aqua-colored glass that appears here on Mindat from time to time.  I remember traveling through Burns with my dad when he bought a burlap bag of green obsidian from the miner in the late '70s.

25th Feb 2020 23:05 GMTVicki Ribal

Your right I don’t remember where it comes from but I do remember the friend who gave it to me which he found said some where in Oregon.

25th Feb 2020 23:10 GMTVicki Ribal

Your absolutely right let me apologize. I was given the two specimens from a good friend who said it was green obsidian. I have other obsidian none being green in my collection. I feel confident it is obsidian but I’m no expert to say the least I’m still trying to learn as much as I can. That’s why I love coming to this website. Next time I’ll post using other words

25th Feb 2020 23:21 GMTVicki Ribal

I’m sorry I should’ve asked for help in identifying. The friend who gave it to me years ago said it was obsidian I called it green it looks green to compared to my black obsidian and I have mahogany as well. I wish I could remember where he got it from I do remember it was from Oregon. I live in a rock hounds ideal place. Thanks again

27th Feb 2020 06:49 GMTKevin Hean

Hi Vicky,
 If you get a piece of know Quartz more or less the same size as your Obsidian and let them both get to room temperature and pick them up, one in each hand, the Obsidian will seem warmer than the Quartz or the Quartz will seem to stay cold for longer, This is a very crude indication test and is not conclusive, A thermal conductivity tester would obviously be much better, some of these "Diamond testers" do have a scale on them and could give you a better indication.  

27th Feb 2020 07:51 GMTKeith Compton Manager

ANY mineral/rock can break if you drop it hard enough
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