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 2:19 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 1016 posts ]  Go to page 1, 2, 3, 4, 5 ... 68  Next
Author Message
 Post subject: Inclusion(s) of the day.
PostPosted: Tue Dec 30, 2008 5:17 pm 
Offline
Moderator
User avatar

Joined: Thu Dec 13, 2007 3:42 pm
Posts: 4091
Location: the Netherlands
Hi all,

I'm thinking it seems like a good idea to shamelessly pinch the 'Stone of the day' initiative and to combine it with the gem quiz thread. I'll be posting shots of some random inclusion here and you can all guess away to what it is you're seeing. The description of the photo is given at the start of each next one 24/48hrs (or so) later. Of course, every addition to this thread is welcomed warmly, if you have magnification going, line it up with a camera and start shooting! I'd love to have a guess as well... :D

first up: where golden pubes meet darker straight ones. 8)

Image

Image

It's the interior of a peridot from Afghanistan (or was it Pakistan, I forgot ) showing two kinds of long slender crystal inclusions. What they are exactly remains a guess, rutile and tourmaline?


Last edited by Tim on Sat Jan 03, 2009 11:18 am, edited 1 time in total.

Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Tue Dec 30, 2008 9:20 pm 
Offline
Platinum Member

Joined: Tue Nov 29, 2005 2:02 pm
Posts: 2646
Quote:
first up: where golden pubes meet darker straight ones.

This doesn't have anything to do with a Pamela Anderson movie they show at Motel 6 does it?


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Dec 31, 2008 5:00 am 
Offline
Gemology Online Übergoddess
User avatar

Joined: Mon Oct 06, 2008 6:13 pm
Posts: 5077
Location: Australia
:smt105

At a New Years Eve Party!!!

Have a safe and memorable New Year everyone.

Merryn.

I dunno....Rutile?


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Dec 31, 2008 5:57 am 
Offline
Site Admin
User avatar

Joined: Fri May 12, 2006 11:24 am
Posts: 7523
Location: Rome, Italy
ok, i'll drop a couple of guess.

Amphibole fibres, possibly Tremolite in Spess garnet.
Sillimanite fibres in tourmaline.
ciao
alberto

_________________
GemmoRaman-532 - GemmoFTIR - GemmoSphere - EXA


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Dec 31, 2008 9:49 am 
Offline
Moderator
User avatar

Joined: Thu Dec 13, 2007 3:42 pm
Posts: 4091
Location: the Netherlands
Pam ey? No pubes on that one... ;)

It's the interior of a peridot from Afghanistan (or was it Pakistan, I forgot :? ) showing two kinds of long slender crystal inclusions. What they are exactly remains a guess, rutile and tourmaline?

Here's a new one:

overview:
Image

detail:
Image

This is a very typical sight in Labradorite from Springsure, Qld. Aus. I believe that we're looking at 'whisps' caused by the often lammelar twinned habit of this material. After seeing the detail picture one could suggest that layers of clear material are seperated from eachother by a distortion in the crystal lattice.


Last edited by Tim on Sat Jan 03, 2009 11:17 am, edited 1 time in total.

Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Dec 31, 2008 10:36 am 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
What intrigues me are the fibrous inclusions that are reminiscent of inclusions one sees in demantoid.
A co worker recently bought a large peridot. She brought it into work and it was riddled with these wavy, fibrous inclusions. We did a little research and found similar inclusions documented in, I believe, Koivula's 2nd Gem Atlas.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Dec 31, 2008 11:03 am 
Offline
Moderator
User avatar

Joined: Thu Dec 13, 2007 3:42 pm
Posts: 4091
Location: the Netherlands
Haven't been able to set eyes on the second atlas just yet, anyone that has acces to it willing to look up the findings of my two heroes on the peridot 'wavy crystals'?


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Dec 31, 2008 11:11 am 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
I'm getting ready to leave for work right now, but if no one finds info by the time I get home, I'll research it.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Dec 31, 2008 12:36 pm 
Offline
Valued Contributor
User avatar

Joined: Fri Nov 02, 2007 2:28 pm
Posts: 186
Location: Belgium
I like inclusions! Here's a picture of some wheatstalks I found lurking in a piece of amethyst. Some reach the surface, they feel (and taste) metallic. No further information available at this point. Good luck! :-k
Image

_________________
Can we become, or must we be?


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Dec 31, 2008 2:31 pm 
Offline
Moderator
User avatar

Joined: Thu Dec 13, 2007 3:42 pm
Posts: 4091
Location: the Netherlands
Kewl! a fellow inclusion lover. Saw that you experienced what seemed to be focusing troubles with the peridot inclusion in your photo album; that's the double refraction doing that for you. You get that with high biref materials; try looking into a sphene! You can tackle it by using a polarizing filter between your objective and your stone (to filter out one image)...

BTW, they taste metallic? :D Write that down on your exam paper!

My guess to their composition: goethite.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Wed Dec 31, 2008 3:19 pm 
Offline
Site Admin
User avatar

Joined: Fri May 12, 2006 11:24 am
Posts: 7523
Location: Rome, Italy
Tim Spauwen, FGA wrote:

My guess to their composition: goethite.


it's my guess too

_________________
GemmoRaman-532 - GemmoFTIR - GemmoSphere - EXA


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Thu Jan 01, 2009 12:28 am 
Offline
Gemology Online Übergoddess
User avatar

Joined: Mon Oct 06, 2008 6:13 pm
Posts: 5077
Location: Australia
You mean I've got to eat my rocks as well!!!
:shock:
I just got them!!! :smt089

I get it, they become gallstones. :P


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Thu Jan 01, 2009 12:55 am 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 21602
Location: San Francisco
Getting back to the peridot, the hair-fine inclusions that were similar in the 2nd Atlas were identified as asbestos fibres or chrysotile. Peridot from Pakistan had similar dark accicular needles identified as ludwigite which proved to be isomorphous with vonsenite.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Thu Jan 01, 2009 1:08 am 
Offline
Gemology Online Übergoddess
User avatar

Joined: Mon Oct 06, 2008 6:13 pm
Posts: 5077
Location: Australia
Tim,
Whats the dots in the Peridot then?


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Thu Jan 01, 2009 7:24 am 
Offline
Moderator
User avatar

Joined: Thu Dec 13, 2007 3:42 pm
Posts: 4091
Location: the Netherlands
Thanks Barbra. Pakistan ey...

mehoose wrote:
Tim,
Whats the dots in the Peridot then?


dots? There's some dust visible (I'm a pig, should clean better).


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1016 posts ]  Go to page 1, 2, 3, 4, 5 ... 68  Next

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 11 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