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Inclusion inside Chalcedony

Posted by mario tapilouw  
mario tapilouw January 11, 2019 09:28AM
Dear All,
I purchased a piece of blue chalcedony and see it under microscope at home. I found some small bubbles inside it, I wonder if chalcedonies have such inclusions? Please find the photos in the attachments.


mario tapilouw January 11, 2019 09:35AM
Sorry for the double post, I don't know what happened.
Scott Rider January 11, 2019 04:31PM
For some reason I cannot see your image. Anyone else having that issue?

I know chalcedony can have a variety of inclusions. Here is a bad image of a pseudomorphic rhomb (my phone camera seems to get worse after each image LOL). It appears that the calcite formed first, then it was altered into chalcedony. Then another generation of chalcedony formed over the pseudomorph. You can also see the organic and jasper fragments that were also covered by chalcedony.

Edited 2 time(s). Last edit at 01/11/2019 04:32PM by Scott Rider.
Wayne Corwin January 11, 2019 05:35PM
I can't see it either Scott.
Scott Rider January 11, 2019 05:50PM
Mario, little more info on inclusions in chalcedony. It can have a large variety of inclusions. Personally, through my digs in the Colorado mountains that yield geodes/chalcedony, I have seen a myriad of inclusions, from organic (fungal roots, twigs, etc.), bubbles, other rocks (usually the host rock that broke and fell into the chalcedony solution), crystals (calcite epimorphs where the chalcedony "swallowed" up the crystals), dirt/sand, etc.

You can think of chalcedony being a watery, silica rich solution, that envelops what ever it can cover while the hydrothermal fluids are flowing through the deposit. Its like water flowing over an object, then it freezes, which makes the ice stick to the object, therefor covering it and I guess at that point, the object would now be an inclusion. Enough of that solution can completely engulf the inclusion, preserving it somewhat. At least that is the layman explanation.
mario tapilouw January 15, 2019 12:45AM
Hi Scott,

Thanks for the comprehensive explanation about chalcedony. I'm just curious because some people told me that if there's a bubble then it might not be a chalcedony, it might be a glass, either man made or natural glass.

I try attaching the pictures again, hope it is uploaded successfully.

Kevin Conroy January 15, 2019 12:57AM
Mario, could you please also post an overall view of the specimen?
mario tapilouw January 16, 2019 06:14AM
Hi Kevin,
Here's the picture, it's already mounted on a ring. I have sent it to a gemologist for test and it turns out to be a glass.
Thanks for your reply.

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