New Mineral Named After GIA’s John Koivula
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Mon Oct 14, 2019 9:07 am

All times are UTC - 4 hours




Post new topic Reply to topic  [ 34 posts ]  Go to page Previous  1, 2, 3  Next
Author Message
 Post subject: Re: Looking for Hard to find stones
PostPosted: Sun Jan 13, 2019 7:49 am 
Offline
Gold Member

Joined: Wed Jan 23, 2013 5:29 pm
Posts: 1014
Location: Paris
How about a nice vanadium chrysoberyl, and of course a cobalt spinel from Vietnam, but with affordable prices. These are hard to find !!!


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Sun Jan 13, 2019 9:05 am 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 849
Isi wrote:
How about a nice vanadium chrysoberyl, and of course a cobalt spinel from Vietnam, but with affordable prices. These are hard to find !!!


No, I have enough... \:D/

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


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Sun Jan 13, 2019 9:15 am 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 849
On my colored stones list:

red and/or blue Taaffeite, red Musgravite

FCD list

a fancy blue(ish)-green or green(ish)-blue intense or vivid diamond.

So expensive...

I am so modest.

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


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Sun Jan 13, 2019 3:50 pm 
Offline
Gold Member

Joined: Wed Jan 23, 2013 5:29 pm
Posts: 1014
Location: Paris
I have both of them : a vivid blue an a green one \:D/

Oh, did you mean naturally colored, nor irradiated ? This is a different story.

There is only one solution : :smt053


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Mon Jan 14, 2019 5:05 am 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 849
Yes, natural untreated....

So only a tiny one with a few points...

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


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Sun Jan 27, 2019 1:33 pm 
Offline
Established Member

Joined: Mon Apr 16, 2018 7:25 am
Posts: 24
dchallener wrote:
I am also looking for some of that Vietnamese transparent "Amazonite".


Or there's the similar mint-green transparent oligoclase from Kenya/Tanzania. AFAIK this is very rare but not too expensive. I have a chunk of rough that shows obvious pleochroism from bluish-green to yellowish green.


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Sun Jan 27, 2019 8:10 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 19848
Location: San Francisco
I'd love to see a picture of that rough.
Please post it. :D


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Mon Jan 28, 2019 12:52 am 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 3391
Location: North Carolina
The pale green stuff from Tanzania is often sold as sunstone, though much of it has a slightly murky tone to it. I have some pale rough somewhere which I picked out from a cab parcel, waiting to be faceted.
Apparently there was some spectacular material from Canada at some point, according to the GIA's documentation of the Gubelin collection:
Image
Though who knows if there was ever more than just the one, he was apparently pretty good at tracking down real rarities.

_________________
https://www.etsy.com/shop/angryturtle


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Mon Jan 28, 2019 4:17 pm 
Offline
Established Member

Joined: Mon Apr 16, 2018 7:25 am
Posts: 24
Barbra Voltaire wrote:
I'd love to see a picture of that rough.
Please post it. :D


Here you go Barbra:

Image

Image

Image

Image

Image

Image

This piece is about 35 mm by 24 mm and about 17-19 mm thick. The weight is about 25 grams.


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Tue Jan 29, 2019 7:03 am 
Offline
Gold Member

Joined: Wed Jan 23, 2013 5:29 pm
Posts: 1014
Location: Paris
Impressive pleochroism indeed ! Especially for a pale stone.
I wonder what it would look like if it were cut ?


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Tue Jan 29, 2019 4:09 pm 
Offline
Established Member

Joined: Mon Apr 16, 2018 7:25 am
Posts: 24
Isi wrote:
Impressive pleochroism indeed ! Especially for a pale stone.
I wonder what it would look like if it were cut ?


Thanks Isi. The pleochroism is very pronounced using the LCD monitor as a source of polarised light. See below:

Image

Image


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Tue Jan 29, 2019 6:10 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 19848
Location: San Francisco
Holy guacamole!
Are you quite sure this is feldspar.


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Tue Jan 29, 2019 6:31 pm 
Offline
Established Member

Joined: Mon Apr 16, 2018 7:25 am
Posts: 24
Barbra Voltaire wrote:
Holy guacamole!
Are you quite sure this is feldspar.


Yes. The base has the typical striations as a result of repeated lamellar twinning. Another pic illustrating this:

Image

I actually bought this specimen about 8 years ago at a mainstream crystal shop in Salisbury. This was something out-of-the-ordinary as I've never seen anything like it for sale since, even at the Kempton Park Rock & Gem shows.


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Fri Feb 15, 2019 11:18 pm 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 3391
Location: North Carolina
This tucson I picked up a crystal of feldspar (raman scan best matches albite, so likely at least plagioclase rather than k-spar of some sort) with very blue zones. It was mixed into a parcel of Madagascar sanidine. I've seen blue cleavlandite before but never this gemmy or this blue.
Image
Image
I also saw some of the classic 'masai sunstone' priced not that awful
Image
and some light blue oligoclase, priced who knows but given the seller definitely high
Image
I also found my baggie of green facet rough pulled from a parcel of cab-grade Masai sunstone. Small and mostly pale, but worthy.
Image

_________________
https://www.etsy.com/shop/angryturtle


Top
 Profile  
Reply with quote  
 Post subject: Re: Looking for Hard to find stones
PostPosted: Fri Feb 15, 2019 11:57 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 19848
Location: San Francisco
Oh! I like that Masai sunstone....where does it come from and does it have anything to do with the Masai?


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 34 posts ]  Go to page Previous  1, 2, 3  Next

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 1 guest


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