January 24 Through February 4—TUCSON, ARIZONA: Annual show
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Thu Mar 28, 2024 9:21 am

All times are UTC - 4 hours




Post new topic Reply to topic  [ 29 posts ]  Go to page Previous  1, 2
Author Message
 Post subject: Re: Unknown green stone.
PostPosted: Fri Mar 25, 2016 2:33 am 
Offline
Established Member
User avatar

Joined: Sat Mar 21, 2015 10:47 pm
Posts: 45
Location: Norway
Yes, im not sure about anything in this stone, only that it looks like cheap treated quartz.
I have a little bit difficulty to believe thats what it is due to I know the seller and he have not at all a interest to sell that to me.
But of course, someone might have been able to scam him.
I also find it strange to be quarts when I make easy to see scratches with both turkish diaspore and peridot.

I will take it to a lab in Hanoi next week.

Thanks for all the input.

_________________
There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here,
it will instantly disappear and be replaced by something even more bizarre and inexplicable.
There is another theory which states that this has already happened...

-Douglas Adams


Top
 Profile  
Reply with quote  
 Post subject: Re: Unknown green stone.
PostPosted: Fri Mar 25, 2016 11:01 am 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
Let us know what you find out. :D


Top
 Profile  
Reply with quote  
 Post subject: Re: Unknown green stone.
PostPosted: Sun Jul 16, 2017 12:07 am 
Offline
New to the Forum or The Quiet Type

Joined: Sat Jul 15, 2017 11:15 pm
Posts: 5
Location: Luc Yen, Vietnam
Hi, im back. I could not figure out my old login as "Bezelbub".

The green piece was looked at by a guy saying he is a gemolog, and had a look in a microscope(only I think) and said it's glass, due to bubbles.
So I thought, ok Barbra, you were right..but not feeling sure, I postponed answering here. Then forgot about the whole piece for a long time.

But ok, I have been getting some more testing equipment lately and also I bough a huge piece of clear green rough of a trusted guy here in Vietnam that is for sure
the vietnamese "transparent amazonite"/orthoclase that I was hoping the piece in this tread would may be.
I saw that this new piece had quite similar color and appearance, but a much more obvious layer structure from what i guess is cleavage. Some areas along the edges looks like the beautiful rice paddies in the mountain sides of Sapa, layers upon layers.

Well, so today I went to my local cutter, got a flat polished, then took the RI, then SG, then checked that it was double refractive and I got this:

Light green rough
Double refractive
64.40ct
Weight in water: 39.29ct
(Loss of weight in water, 25.11ct)
RI: 1.53 (still training on my new fable 003)
SG: 2.56

Which suggest it was exactly what I was hoping for when I bought it. Right? Or did I go wrong somewhere? Or what else can it be if I did my test right?

Thoughts?

Geir Atle


Top
 Profile  
Reply with quote  
 Post subject: Re: Unknown green stone.
PostPosted: Sun Jul 16, 2017 1:55 pm 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 850
Hi Geir,

maybe Apophyllite...( not sure...)

http://www.classicgems.net/gem_apophyllite.htm

If you click on "information" there is a list of all RIs ( most gems - some are missing)...

Maybe this helps.

Is it the single item on your instagram account?

_________________
http://www.gemstore-24.com/
gemstones, precision cuts and more...


Top
 Profile  
Reply with quote  
 Post subject: Re: Unknown green stone.
PostPosted: Mon Jul 17, 2017 10:41 am 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 4015
Location: North Carolina
I don't think it is likely he would mistake apophyllite for any gem material in the rough. It has a weird plasticy feel and is very very cleavey.

_________________
Rough and cut classic and exotic synthetic gems:https://store.turtleshoard.com


Top
 Profile  
Reply with quote  
 Post subject: Re: Unknown green stone.
PostPosted: Mon Jul 17, 2017 1:20 pm 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 850
Stephen Challener wrote:
I don't think it is likely he would mistake apophyllite for any gem material in the rough. It has a weird plasticy feel and is very very cleavey.


O.K. :smt023

What do think it is - course for vietnam "amazonite" quite large and clean - which would be great!! A beautiful material indeed.

_________________
http://www.gemstore-24.com/
gemstones, precision cuts and more...


Top
 Profile  
Reply with quote  
 Post subject: Re: Unknown green stone.
PostPosted: Wed Jul 19, 2017 1:44 am 
Offline
New to the Forum or The Quiet Type

Joined: Sat Jul 15, 2017 11:15 pm
Posts: 5
Location: Luc Yen, Vietnam
Thanks guys, I own two large pieces and one cut oval of 3.80ct-ish of what has the same data, one is this rough 64ct one, and one huge 180ct one, both posted in instagram, probably more then once. The 180ct one has a huge clean gem in it, but a bit lighter in color. Its posted in my private facebook group too, found by searching BalderGems(not page, but group).

I will check this apophyllite if the case is overlapping characteristics. Thanks!

I also have a few more pieces of less facet quality, but still cuttable, so it starts to heap up, just need to be 100% sure what it is, and that its from here, which I know really, but how to be credible and "prove" that?

Geir Atle Gussiås

https://www.facebook.com/groups/baldergems/


Top
 Profile  
Reply with quote  
 Post subject: Re: Unknown green stone.
PostPosted: Wed Jul 19, 2017 1:52 am 
Offline
New to the Forum or The Quiet Type

Joined: Sat Jul 15, 2017 11:15 pm
Posts: 5
Location: Luc Yen, Vietnam
64 ct + 180ct + 3.80ct facet. It all points to Minh Tien, 1998 pocket of green feldspar and test same numbers as mentioned over.
Added Led light in this photo and takes a nice glow. Tried to edit as much as possible to look as in person, seen in my iMac display.
Beside this I have some untested smaller pieces as suspects, and a confirmed one that is recently mined. It seem they find very randomly this material still.

Geir Atle

Video of the 180ct: https://www.instagram.com/p/BWdON6uADaR ... ems_&hl=en
Video of the 64ct: https://www.instagram.com/p/BWmGY4eAENu ... ems_&hl=en

https://www.facebook.com/groups/baldergems/


Attachments:
File comment: That top left piece is 180ct. Thats huge, haha. This photo is very near how it looks in person when adding some light.
19990542_10155497355905126_5585493495517973359_n.jpg
19990542_10155497355905126_5585493495517973359_n.jpg [ 19.7 KiB | Viewed 1132 times ]
Top
 Profile  
Reply with quote  
 Post subject: Re: Unknown green stone.
PostPosted: Wed Jul 19, 2017 3:37 am 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 850
You say "nice glow" when using a LED - you checked LW and SW UV?

_________________
http://www.gemstore-24.com/
gemstones, precision cuts and more...


Top
 Profile  
Reply with quote  
 Post subject: Re: Unknown green stone.
PostPosted: Wed Jul 19, 2017 3:47 pm 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 4015
Location: North Carolina
Traditional translucent amazonite can have a wonderful paraiba-like glow in some cases despite its lack of fluoresence. I have never seen one of these faceted ones in person but the chromophore is the same so it would not surprise me if they showed a similar effect.

_________________
Rough and cut classic and exotic synthetic gems:https://store.turtleshoard.com


Top
 Profile  
Reply with quote  
 Post subject: Re: Unknown green stone.
PostPosted: Wed Jul 19, 2017 5:09 pm 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 850
I have seen some in real life - small, often not eyeclean - so Geir rough is really usual - hope we get news from Vietnam.

_________________
http://www.gemstore-24.com/
gemstones, precision cuts and more...


Top
 Profile  
Reply with quote  
 Post subject: Re: Unknown green stone.
PostPosted: Sat Jul 22, 2017 3:19 pm 
Offline
New to the Forum or The Quiet Type

Joined: Sat Jul 15, 2017 11:15 pm
Posts: 5
Location: Luc Yen, Vietnam
Hi,

I did a quick check with LW UV which is the only UV light I have at hand, and it dont show any other reaction then a bit coloring of the UV light itself and a colorless glow or how to describe it. It looses its green. White-ish or maybe what gemmos describe as chalky? Maybe my vision just get a bit blurred from the UV light. Not sure.
Size of clean parts in these rough is unusual indeed, and I'm looking forward to see them as a precision cut suite one day which would be optimal. Let's see what is possible :roll: :mrgreen:

Geir Atle


Top
 Profile  
Reply with quote  
 Post subject: Re: Unknown green stone.
PostPosted: Sun Jul 23, 2017 7:59 am 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 850
Hope you will give us infos after you cut the rough.

Do you have the RIs of the cut stone and the optic character?

_________________
http://www.gemstore-24.com/
gemstones, precision cuts and more...


Top
 Profile  
Reply with quote  
 Post subject: Re: Unknown green stone.
PostPosted: Tue Aug 01, 2017 12:31 am 
Offline
New to the Forum or The Quiet Type

Joined: Sat Jul 15, 2017 11:15 pm
Posts: 5
Location: Luc Yen, Vietnam
Hi, I will update whatever happens to this rough, but it might take some time since I both want to keep them, and get them precision cut into a suite. Which my budget don't allow me to make a priority right now.

All my RI readings are 1.52 or above and in one direction 1.525-ish or so. Low birefringence. Most of the readings looks very much like 1.522 on my Fable 003.
When I look into the RI-list in IGS it seem closer to amazonite, then orthoclase. Ill check more lists and compare.

Geir Atle


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 29 posts ]  Go to page Previous  1, 2

All times are UTC - 4 hours


Who is online

Users browsing this forum: Google [Bot] and 6 guests


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 post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Gemology Style ported to phpBB3 by Christian Bullock