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...
first up: where golden pubes meet darker straight ones. 8)
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.
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:
detail:
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.
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.
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'?
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!
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? Write that down on your exam paper!
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.
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