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 Tue Mar 19, 2024 1:48 am

All times are UTC - 4 hours




Post new topic Reply to topic  [ 17 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: Can Anyone Help with This transparent Stone
PostPosted: Sun Feb 14, 2021 11:56 am 
Offline
Established Member

Joined: Sun Feb 07, 2021 4:01 pm
Posts: 26
Hi
First of all thanks for reading this post

Can anyone help in identifying this gemstone

i am new to gemology but very keen to learn

here is what ive got so far

Magnetism = No or my magnet is weak
Specific Gravity= 2.53
Pleochroism= None
chelsea filter reaction = goes transparent green
UV = no reaction
RI ( using digital refractometer) =1.385 - 1.545 = -0.16



Any help would be much appreciated


Attachments:
My Snapshot_19.jpg
My Snapshot_19.jpg [ 57.41 KiB | Viewed 3909 times ]
My Snapshot_18.jpg
My Snapshot_18.jpg [ 60.3 KiB | Viewed 3909 times ]
My Snapshot_17.jpg
My Snapshot_17.jpg [ 61.6 KiB | Viewed 3909 times ]
My Snapshot_16.jpg
My Snapshot_16.jpg [ 66.34 KiB | Viewed 3909 times ]
Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Sun Feb 14, 2021 3:48 pm 
Offline
Moderator
User avatar

Joined: Mon Apr 02, 2012 9:31 pm
Posts: 4015
Location: North Carolina
Thr crystal form is fairly diagnostic of quartz.

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


Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Sun Feb 14, 2021 6:49 pm 
Offline
Established Member

Joined: Sun Feb 07, 2021 4:01 pm
Posts: 26
Thank you


Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Sun Feb 14, 2021 7:43 pm 
Offline
Gold Member

Joined: Thu May 12, 2016 2:18 am
Posts: 1542
I hope you are noticing how useless the digital refractive index number are. Thank that machine out and crush it with your car.


Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Sun Feb 14, 2021 8:11 pm 
Offline
Gold Member
User avatar

Joined: Tue Apr 05, 2016 7:58 pm
Posts: 1424
Location: San Marcos, CA
1bwana1 wrote:
I hope you are noticing how useless the digital refractive index number are. Thank that machine out and crush it with your car.

LOL. While your at it, give it company with the whatever the SG readings are coming from. I guess I shouldn't say that here as the SG isnt bad if it is quartz.
But not to be to critical the photos are better than most, and it looks like some of the double terminated petroleum quartz crystals I have seen.

_________________
The Gem Garden
San Marcos, CA


Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Sun Feb 14, 2021 9:10 pm 
Offline
Gold Member

Joined: Thu May 12, 2016 2:18 am
Posts: 1542
1bwana1 wrote:
I hope you are noticing how useless the digital refractive index number are. Take that machine out and crush it with your car.


Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Tue Feb 16, 2021 4:21 pm 
Offline
Established Member

Joined: Sun Feb 07, 2021 4:01 pm
Posts: 26
I probably will scrap the SG tester, and go the hemisphere type.

Thanks for the advice.

Learning a lot.


Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Wed Feb 17, 2021 6:02 pm 
Offline
Established Member

Joined: Sun Feb 07, 2021 4:01 pm
Posts: 26
Yes returning the digital refractometer


Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Thu Feb 18, 2021 12:03 am 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21600
Location: San Francisco
As I mentioned in another one of your "Can anyone help" posts, I pointed out that digital reflectometers are not digital refractometers.
Furthermore, they are very unreliable.

Whenever someone mentions the Chelsea Filter, I think of Tim Spauwen's (one of our original MODS) instructions for proper use of the Chelsea Filter.
Tim Spauwen wrote:
Find a bright window.
Open it up.
Throw filter outside.
Close window.


Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Thu Feb 18, 2021 4:02 am 
Offline
Established Member

Joined: Sun Feb 07, 2021 4:01 pm
Posts: 26
Wow :shock: so the Chelsea filter is also useless, what tools would you recommend for someone who is new, on a budget ( affordable ) ?


Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Thu Feb 18, 2021 2:14 pm 
Offline
Gold Member
User avatar

Joined: Tue Apr 05, 2016 7:58 pm
Posts: 1424
Location: San Marcos, CA
Not a complete waste, can be used to quickly isolate certain types of light blue gems in larger parcels. But not an everyday go-to for individual stone testing. I may be wrong but was intentionally for identifying dye in Jade?

_________________
The Gem Garden
San Marcos, CA


Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Thu Feb 18, 2021 3:46 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21600
Location: San Francisco
As Dr. Hanneman used to say with some regularity, "Filters are confirmative, not determinative."

That means, that if you have a parcel of stones which are supposed to be aquamarine and you view it with the Chelsea and all appear the same, that will not determine that you have aqua, it will simply indicate that it is likely all your stones are compositionally the same.

If one jumps out as a different color with the filter, it is likely that that stone is not the same as the others.

But, you have not determined the identity of anything, just confirmed that several are likely the same and one is not.

Make sense?

This is a tool which is useful in lapidary circles, but I would not recommend it for gemological use.


Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Thu Feb 18, 2021 3:51 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21600
Location: San Francisco
Quote:
I may be wrong but was intentionally for identifying dye in Jade?
Perhaps at one point, before common bleaching and impregnation was widely used.
I would not use it on contemporary examples of jadeite (or any examples frankly). For treatment verification we can currently only trust Raman and FTIR for jadeite..


Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Thu Feb 18, 2021 4:13 pm 
Offline
Gold Member
User avatar

Joined: Tue Apr 05, 2016 7:58 pm
Posts: 1424
Location: San Marcos, CA
Thanks Barbra well said in the gemological way. We used it in this sense more of a in the field quickly to separate for further testing, or to see if the parcels were tainted or an untrustworthy source.

_________________
The Gem Garden
San Marcos, CA


Top
 Profile  
Reply with quote  
 Post subject: Re: Can Anyone Help with This transparent Stone
PostPosted: Thu Feb 18, 2021 4:52 pm 
Offline
Established Member

Joined: Sun Feb 07, 2021 4:01 pm
Posts: 26
Just an update of the SG reading using a 0.00 scale = 2.59 which marries upto quartz, you guys have been so helpful, thanks.

I have ordered a 0.000 scale so May update the result once more but I’m convinced on this one.

Thanks for your expertise.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 17 posts ]  Go to page 1, 2  Next

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 3 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:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Gemology Style ported to phpBB3 by Christian Bullock