December 14-16—SAN DIEGO, CALIFORNIA: Wholesale and retail show; Gem Faire Inc.; Scottish Rite Center, 1895 Camino del Rio S; Fri. 12-6, Sat. 10-6, Sun. 10-5
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Mon Dec 10, 2018 8:03 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 147 posts ]  Go to page 1, 2, 3, 4, 5 ... 10  Next
Author Message
 Post subject: Usual and unusual gemstones and inclusions
PostPosted: Fri Feb 13, 2015 9:45 am 
Offline
Valued Contributor

Joined: Wed Feb 11, 2015 5:22 pm
Posts: 170
Location: Lachine, Quebec
I am picturing inclusions using my trinocular microscope. Unfortunately there is some technical imperfection in magnification switching mechanism, caused that some small tiny particles, swarf type, fаlling and accumulating on the inner surface of the lens. When I use stacking of multifocus pictures, that particles live "evidences" as more and bright as higher magnification... So unfortunately many of my pictures are with visual imperfections, but still looks interesting to my eyes...

PS: I am getting new microscope which I hope will be free form such а technical flaw...

~~~~

The first gem I would like to share here is unusual petalite, originated from Burma. The most of what is unusual in this gem is color, not saturated medium green-yellow under day light, shifting into not saturated light reddish orange under incandescent light. First what visualisation of this color shift reminds is same effect in diaspore.. Pictures has been taken under natural day light (~6000K) and under cool day light (~3000K)

Image

On pictures are visible some inclusions. On the right hand from the center is visible long needle like inclusion. After observation using microscope I found that this лong transparent rhombic cavity with large diagonal is about 5 times longer than the short diagonal. Also several growths on the cavity with hexagonal cross-section аре visible. I don't know about nature of this inclusion.

60x. Transmitted polarized light. Length of view ~ 2.5mm
Image

Another inclusion is visible in upper left part of pear. There is cross-like non-transparent inclusion, not reaching the surface. It has metallic luster to my eyes.

60x, mixed (transmitted and fiber) polarized light. Length of view ~ 2.5mm
Image

When my wife saw the picture taken under higher magnification, she said - it is alien body included in stone.. Like visible legs, arms, head and even ribs... :)

100x, polarized light
Image

I don't know about nature of this inclusion also and can not find any refers nor in Atlas, nor using different web-sources. So any suggestions are welcomed.

Best Regards!
Mark


Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Sat Feb 14, 2015 12:29 am 
Offline
Valued Contributor

Joined: Wed Feb 11, 2015 5:22 pm
Posts: 170
Location: Lachine, Quebec
Another stone, one of first I pictures, a few years ago... Quartz with hematite from Madagascar....

Image

... and a few quartz crystals, hosted in this quartz.

Image


Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Sat Feb 14, 2015 12:41 pm 
Offline
Site Admin
User avatar

Joined: Sun Oct 16, 2005 12:22 pm
Posts: 19173
Location: San Francisco
Great shots!
Keep them coming!


Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Sat Feb 14, 2015 9:16 pm 
Offline
Valued Contributor

Joined: Wed Feb 11, 2015 5:22 pm
Posts: 170
Location: Lachine, Quebec
Thank you, Barbra!

I will keep them coming.. :)


Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Sat Feb 14, 2015 9:40 pm 
Offline
Valued Contributor

Joined: Wed Feb 11, 2015 5:22 pm
Posts: 170
Location: Lachine, Quebec
A few nice and not very usual looking cordierites - iolites from India with strong aventurescence caused by hematite inclusions.

Image
Image
Image

The last pear shaped stone was not that much included, so I was able to look inside a bit deeper.

Hematite itself, 40x, transmitted light, dark filed:
Image

On the left bottom part of picture is visible some "window" of more transparent area with some crystals in there, so I went even more deep into this "window".

120x, transmitted light, dark filed:
Image

Longish transparent hexagonal crystals are apatite if I am not mistaken with identification, black crystal is pyrrhotite or maybe magnetite, don't know exactly, but think about pyrrhotite more... Large crystal behind black is zircon (again -not sure, it is just my guess).


Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Mon Feb 16, 2015 8:28 am 
Offline
Valued Contributor

Joined: Wed Feb 11, 2015 5:22 pm
Posts: 170
Location: Lachine, Quebec
Emerald trapiche 2.68 ct from Muzo...

Image

and small crystal of parisite in the root matrix:

Image

Reflected light, magnification 200x. One of the very first of my shots, I did not even know about multifocused pictures and stacking.. :)


Last edited by GSK on Fri Feb 27, 2015 7:52 am, edited 1 time in total.

Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Wed Feb 25, 2015 4:16 pm 
Offline
Valued Contributor

Joined: Wed Feb 11, 2015 5:22 pm
Posts: 170
Location: Lachine, Quebec
Some inclusions in Brazil (Hematita) alexsandrites:

Fluorite crystal, 100x
Image

Fluid inclusions, 100x
Image

Calcite crystal, 100x
Image


Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Thu Feb 26, 2015 6:02 pm 
Offline
Valued Contributor
User avatar

Joined: Sun Jul 15, 2012 6:29 pm
Posts: 321
Location: Los Angeles, CA
cool stuff!

_________________
The Art of Photomicrography:
http://www.dannyjsanchez.com
http://mineralien.tumblr.com


Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Fri Feb 27, 2015 1:16 am 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 811
MORE!!!!!!

Super!!! Like these pics so much!!!

_________________
http://www.gemstore-24.com/
gemstones, precision cuts and more...


Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Fri Feb 27, 2015 8:50 am 
Offline
Valued Contributor

Joined: Wed Feb 11, 2015 5:22 pm
Posts: 170
Location: Lachine, Quebec
Thank you, Danny! Your photo-creations, your pictures together with some other were the cause turning of my interest into learning this on!

Thank you, Marlow! Will be more.. :)

_________________
All stones are alike, all stones are precious; but man sees only a few of them...
Maurice Maeterlinck


Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Sat Feb 28, 2015 2:36 pm 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 811
The Alexandrite pics are great!! Can you post a picture of the whole gem?? Carat weight??

I remember pictures of negative crystals in some tanzanian ( Lake Manyara ) alexandrite in a beautiful "V" shape ( contact twins).

Maybe you discover something similar??

_________________
http://www.gemstore-24.com/
gemstones, precision cuts and more...


Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Sat Feb 28, 2015 8:04 pm 
Offline
Valued Contributor

Joined: Wed Feb 11, 2015 5:22 pm
Posts: 170
Location: Lachine, Quebec
No, something like V-twinned crystals I did not see jet.

There are stones.. Fluorite crystal I found in this small ~0.4 cts oval

Image

Liquid inclusions and calcite crysta is in this small round 0.36 cts stone:

Image

_________________
All stones are alike, all stones are precious; but man sees only a few of them...
Maurice Maeterlinck


Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Sun Mar 01, 2015 9:55 am 
Offline
Gemology Online Veteran
User avatar

Joined: Mon Jun 16, 2014 1:10 pm
Posts: 811
Thank you - you got both from Multicolorgems??

_________________
http://www.gemstore-24.com/
gemstones, precision cuts and more...


Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Sun Mar 01, 2015 9:59 am 
Offline
Valued Contributor

Joined: Wed Feb 11, 2015 5:22 pm
Posts: 170
Location: Lachine, Quebec
Yes, from there..

_________________
All stones are alike, all stones are precious; but man sees only a few of them...
Maurice Maeterlinck


Top
 Profile  
Reply with quote  
 Post subject: Re: Usual and unusual gemstones and inclusios
PostPosted: Sun Mar 01, 2015 6:14 pm 
Offline
Valued Contributor

Joined: Wed Feb 11, 2015 5:22 pm
Posts: 170
Location: Lachine, Quebec
Demantoid 2.60 cts, origin - Bobrovka river, Nizhni Tagil region, Ural, Russia. Not heated. Picture of stone itself is not mine, I am not able to take such shots.

Image

Horsetail in this stone:

80x, fluorescent reflected light
Image

120x, transmitted light
Image

200x, transmitted light
Image

_________________
All stones are alike, all stones are precious; but man sees only a few of them...
Maurice Maeterlinck


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 147 posts ]  Go to page 1, 2, 3, 4, 5 ... 10  Next

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 2 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