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 Post subject: Inclusion(s) of the day.
PostPosted: Tue Dec 30, 2008 5:17 pm 
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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.

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PostPosted: Tue Dec 30, 2008 9:20 pm 
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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?


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PostPosted: Wed Dec 31, 2008 5:00 am 
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:smt105

At a New Years Eve Party!!!

Have a safe and memorable New Year everyone.

Merryn.

I dunno....Rutile?


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PostPosted: Wed Dec 31, 2008 5:57 am 
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ok, i'll drop a couple of guess.

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

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PostPosted: Wed Dec 31, 2008 9:49 am 
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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.

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PostPosted: Wed Dec 31, 2008 10:36 am 
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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.


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PostPosted: Wed Dec 31, 2008 11:03 am 
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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'?


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PostPosted: Wed Dec 31, 2008 11:11 am 
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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.


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PostPosted: Wed Dec 31, 2008 12:36 pm 
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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

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PostPosted: Wed Dec 31, 2008 2:31 pm 
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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.


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PostPosted: Wed Dec 31, 2008 3:19 pm 
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Tim Spauwen, FGA wrote:

My guess to their composition: goethite.


it's my guess too

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PostPosted: Thu Jan 01, 2009 12:28 am 
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You mean I've got to eat my rocks as well!!!
:shock:
I just got them!!! :smt089

I get it, they become gallstones. :P


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PostPosted: Thu Jan 01, 2009 12:55 am 
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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.


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PostPosted: Thu Jan 01, 2009 1:08 am 
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Tim,
Whats the dots in the Peridot then?


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PostPosted: Thu Jan 01, 2009 7:24 am 
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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).


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