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 Post subject: Name the gem
PostPosted: Sun Aug 06, 2006 1:50 pm 
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A milkly haze appears along with these typical inclusions that give this gem it's trade name.

Name the gem.

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PostPosted: Sun Aug 06, 2006 3:37 pm 
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I'll bite -- moss agate?

p

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PostPosted: Sun Aug 06, 2006 3:54 pm 
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That's what I thought also, but you know JB - that would be way too easy...


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PostPosted: Sun Aug 06, 2006 4:07 pm 
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"hound of the baskervillionite"

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Proud to be a DSN and JTV shopper, just love the guys!


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PostPosted: Sun Aug 06, 2006 4:33 pm 
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A+ for pt.

After a couple of tough quizes, I thought I'd lighten up this time. :)


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PostPosted: Mon Aug 07, 2006 7:38 am 
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oh, sure -- the one I can get right off gets labeled "the easy one." (thanks for keeping me humble!) :D

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PostPosted: Mon Aug 07, 2006 9:25 am 
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lol pt,

I guess "easy" is relative to whether you know the answer or not....and you did! :wink:


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PostPosted: Mon Aug 07, 2006 9:38 am 
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I'm curious JB, where did you get the "milky haze" reference? I can't find it in any of my books. :?:


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PostPosted: Mon Aug 07, 2006 10:03 am 
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Hi Snizz,

It's not from any reference book. I was just describing a feature that is present in this stone. It was a bit of a "smokescreen" to deter you from the identifying moss like inclusions. :) Don't know what causes the haze.


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PostPosted: Mon Aug 07, 2006 11:20 am 
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Good smokescreen, JB! At first glance I thought "dendritic agate", but then remembered moss agate. The milky haze was confusing however as I don't remember ever seeing that hazy, billowy effect in a moss agate. It would be interesting to find out the cause.


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PostPosted: Mon Aug 07, 2006 11:33 am 
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My guess is the haze is just the concentric growth zoning in the chalcedony. This stuff is translucent, not transparent -- but it's close enough to transparent in this pic to make you think it should be see-through. The hazy effect sorta reminds me of the super-humid air here in Indiana the past week or so...

I'd also guess that the way JB has it lit for taking his picture exaggerates the effect -- most of the time you don't see agates back-lit like this.

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PostPosted: Mon Aug 07, 2006 11:58 am 
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Yes, it is translucent. The image was taken in darkfield with the stage fluorescent light on.

Here's the stone.

Image

For those of you that have the GIA Colored Stone course materials, you can go to lesson #20 (quartz and chalcedony) pg. 46 and see a similar image to the one I posted. It too shows this milky translucency.


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PostPosted: Mon Aug 07, 2006 1:19 pm 
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JB wrote:
For those of you that have the GIA Colored Stone course materials, you can go to lesson #20 (quartz and chalcedony) pg. 46 and see a similar image to the one I posted. It too shows this milky translucency.


Geesh, I looked there yesterday. I think the heat and humidity are finally taking their toll. :P


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