December 16-18—SAN DIEGO, CALIFORNIA: Wholesale and retail show; Gem Faire inc, Scottish Rite Center; Fri. 12-6, Sat. 10-6, Sun. 10-5
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Fri Dec 09, 2016 1:50 am

All times are UTC - 4 hours




Post new topic Reply to topic  [ 10 posts ] 
Author Message
 Post subject: Re: Cristinite
PostPosted: Wed Jan 25, 2012 11:30 am 
Offline
Gemology Online Royal Princess
User avatar

Joined: Mon Oct 17, 2005 10:56 am
Posts: 6463
Location: Hey! Who turned off summer?! : /
Can't wait to see what it looks like when he takes his time :shock: !

_________________
ISG Registered Gemologist
GIA Graduate Gemologist

barbaraellisdesigns.com


Share on FacebookShare on Twitter
Top
 Profile  
 
 Post subject: Re: Cristinite
PostPosted: Thu Jan 26, 2012 10:30 am 
Offline
Gold Member

Joined: Sun Jun 28, 2009 9:56 am
Posts: 1182
just curious, what is called christinite ? is it CZ ?


Share on FacebookShare on Twitter
Top
 Profile  
 
 Post subject: Re: Cristinite
PostPosted: Thu Jan 26, 2012 11:00 am 
Offline
Active Member

Joined: Tue Apr 21, 2009 3:23 am
Posts: 71
Location: Brisbane, Australia
cascaillou wrote:
just curious, what is called christinite ? is it CZ ?


Cristinite is an entirely different synthetic to CZ.

From what I understand, it is reconstituted chrysoprase, made under specific lab conditions with some added dopants. Technically it could be synthetic transparent Chalcedony, however if they simply melted it, kept the silica and didn't get any crystallization, it would be glass.

Depending on the colour and batch, optical properties and SG do vary wildly.

It is made in Australia, and has a bit of a following with hobbyists, but at a similar price to synthetic spinel or CZ, is not super popular for jewelry.


Last edited by Lawrence on Thu Jan 26, 2012 7:22 pm, edited 1 time in total.

Share on FacebookShare on Twitter
Top
 Profile  
 
 Post subject: Re: Cristinite
PostPosted: Thu Jan 26, 2012 11:14 am 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 17503
Location: San Francisco
I found a site selling the stuff:
http://www.gemcutter.com/cristinite.htm

I would be curious to have someone test the material with crossed polars and let us know the reaction.


Share on FacebookShare on Twitter
Top
 Profile  
 
 Post subject: Re: Cristinite
PostPosted: Thu Jan 26, 2012 4:26 pm 
Offline
Gold Member

Joined: Mon May 14, 2007 11:00 am
Posts: 1099
Location: Monterey, CA
Barbra Voltaire wrote:
I would be curious to have someone test the material with crossed polars and let us know the reaction.

Why bother? If it weren't glass, the "inventor" or some scientist would have written a technical article touting it as the only known gem material in that RI range that was not birefringent, and they would have published an X-ray diffraction pattern to prove it. :D


Share on FacebookShare on Twitter
Top
 Profile  
 
 Post subject: Re: Cristinite
PostPosted: Fri Jan 27, 2012 3:21 pm 
Offline
Gold Member

Joined: Sun Jun 28, 2009 9:56 am
Posts: 1182
I'm curious to know what is the exact chemical composition (SiO2?), what are the dopants, what is the structure (amorphous, cryptocrystalline, or crystalline? isotropic or anisotropic?) and what's the fabrication process (fusion?).
If someone finds out let us know :-)


Share on FacebookShare on Twitter
Top
 Profile  
 
 Post subject: Re: Cristinite
PostPosted: Sat Jan 28, 2012 10:55 am 
Offline
Active Member

Joined: Thu Sep 15, 2011 2:58 pm
Posts: 74
Cristinite is a trade name for a variety of silica-based doped glasses of varying SG and RI, but all sold under the name "Cristinite". It's just a made-up name for marketing.
The material is cheap and easy to cut and polish if you are not too aggressive at the coarser stages, because it is rather brittle.

This makes it an ideal material for test cutting or maybe even earrings or pendants for re-sale, so long as the customer is warned "It's brittle!"

Wayne


Share on FacebookShare on Twitter
Top
 Profile  
 
 Post subject: Re: Cristinite
PostPosted: Sat Jan 28, 2012 11:11 am 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 17503
Location: San Francisco
Wayne, thank you for the definitive answer.
Dr. Hanneman was correct and it is what I suspected as well.
Cristinite=GLASS.


Share on FacebookShare on Twitter
Top
 Profile  
 
 Post subject: Re: Cristinite
PostPosted: Sat Jan 28, 2012 12:00 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 17503
Location: San Francisco
Jeffrey Hunt wrote:
With a controlled RI this Cristinite is the perfect glass for what I was looking for with a test cut - I originally had this post under Synthetics and Treatments. :)
.


It was moved because the premise of the thread is not about "Cristinite: man-made glass", it is about lapidary.
:D


Share on FacebookShare on Twitter
Top
 Profile  
 
 Post subject: Re: Cristinite
PostPosted: Mon Jun 11, 2012 8:11 pm 
Offline
Valued Contributor
User avatar

Joined: Sat Aug 25, 2007 10:06 am
Posts: 333
lightbender57 wrote:
Cristinite is a trade name for a variety of silica-based doped glasses of varying SG and RI, but all sold under the name "Cristinite". It's just a made-up name for marketing.
The material is cheap and easy to cut and polish if you are not too aggressive at the coarser stages, because it is rather brittle.

This makes it an ideal material for test cutting or maybe even earrings or pendants for re-sale, so long as the customer is warned "It's brittle!"

Wayne


I agree it is great fun to cut, & so easy to polish - I have cut several pieces and posted pictures of some them here...
It is not ideal, however, or even appropriate in my opinion, for any type of jewelry for re-sale. I have a pendant that I set and wear myself, and I love it, I but would never give or sell a piece to someone else. Drop it on your dresser once, and it's chipped. Been there. Not fun.


Share on FacebookShare on Twitter
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 4 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