Novembr 16-18—COLUMBIA, SOUTH CAROLINA: Annual show; The Columbia, SC Gem and Mineral Society; Fri. 10-6, Sat. 10-6, Sun. 12-5
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Sat Nov 17, 2018 3:18 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 10 posts ] 
Author Message
 Post subject: Removing ruby matrix
PostPosted: Sun Oct 14, 2018 11:56 am 
Offline
New to the Forum or The Quiet Type

Joined: Thu Oct 11, 2018 9:56 am
Posts: 10
Hi,

For rough rubies, what sort of chemicals would you advice using in order to take the matrix/external rock off? Is Hydrochloric acid enough?

Thankyou.


Attachments:
IMG_5086.JPG
IMG_5086.JPG [ 2.2 MiB | Viewed 455 times ]
Top
 Profile  
Reply with quote  
 Post subject: Re: Removing ruby matrix
PostPosted: Sun Oct 14, 2018 7:57 pm 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 3011
Location: North Carolina
No, that matrix is likely mica and hcl isn't going to do much to it. They use hydrofluoric acid to remove silicate impurities from included rubies prior to lead glass filling, but I would not recommend coming anywhere close to the stuff. It's incredibly nasty.


Top
 Profile  
Reply with quote  
 Post subject: Re: Removing ruby matrix
PostPosted: Sun Oct 14, 2018 10:00 pm 
Offline
Valued Contributor

Joined: Thu May 12, 2016 2:18 am
Posts: 326
I hated using hydrofluoric in my Geology lab classes. Very dangerous stuff, and extreme safety procedures along with protective equipment is required.


Top
 Profile  
Reply with quote  
 Post subject: Re: Removing ruby matrix
PostPosted: Mon Oct 15, 2018 2:40 am 
Offline
New to the Forum or The Quiet Type

Joined: Thu Oct 11, 2018 9:56 am
Posts: 10
Ok great. I will give it a try! Mr Google is also suggesting using the acid in small time frames. Is this correct.. it is difficult to accept any old garbage that is put on the internet these days.

Thankyou, much appriecated!


Top
 Profile  
Reply with quote  
 Post subject: Re: Removing ruby matrix
PostPosted: Mon Oct 15, 2018 1:46 pm 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 3011
Location: North Carolina
It might be worth trying hcl. It is easy to gwt and can be handled safely, and in one csse cleaned up a tourmaline on quartz specimen of my dad's from being ok to being amazing.
Don't try HF. It goes right through your skin and melts your bones from the inside.


Top
 Profile  
Reply with quote  
 Post subject: Re: Removing ruby matrix
PostPosted: Sat Oct 20, 2018 7:18 am 
Offline
New to the Forum or The Quiet Type

Joined: Thu Oct 11, 2018 9:56 am
Posts: 10
Been away for a while... but tried HLC and it seems not to be working. The water turns a light green after a while, but no real matrix was removed... looks like i will have to look for something else..


Top
 Profile  
Reply with quote  
 Post subject: Re: Removing ruby matrix
PostPosted: Sun Oct 21, 2018 9:21 am 
Offline
Valued Contributor

Joined: Thu May 03, 2007 1:19 am
Posts: 358
Location: Pakistan
If it is not a learning excercise I think grinding away the outer crust would be a safer way for this particular stone. Acids can destroy good cabbing mtrl by tunneling through wherever incls break the surface.

Good luck.


Top
 Profile  
Reply with quote  
 Post subject: Re: Removing ruby matrix
PostPosted: Sun Oct 21, 2018 4:05 pm 
Offline
Valued Contributor

Joined: Thu Mar 19, 2015 9:55 am
Posts: 469
Yes, I would have thought that grinding it away would be the best option. Get a coarse diamond whetstone and cut away under water by hand. Slow but safe and effective.


Top
 Profile  
Reply with quote  
 Post subject: Re: Removing ruby matrix
PostPosted: Fri Oct 26, 2018 5:43 am 
Offline
New to the Forum or The Quiet Type

Joined: Thu Oct 11, 2018 9:56 am
Posts: 10
I have been experimenting recently, using some lesser quality stones, with cutting using a diamond tipped disc. It seems to be working, but is there any chance that by cutting i can make the fractures inside worse.

Will post my progress, cheers guys.


Top
 Profile  
Reply with quote  
 Post subject: Re: Removing ruby matrix
PostPosted: Sat Oct 27, 2018 1:13 pm 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 3011
Location: North Carolina
It can be a problem if it gets hot, so you'll want some sort of coolant if possible. Otherwise that is just normal gem cutting, and probably the best approach. Just make sure not to breathe rock dust.


Top
 Profile  
Reply with quote  
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 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