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How to check for repair in a mineral using Microscope

Posted by Aqua marine  
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Aqua marine March 26, 2017 09:12PM
Hi
I am about to buy a tall quartz cluster. However i want to be sure that every crystal is natural and no crystal has been repaired. I will ask a friend who has a Microscope.
Can you tell me what to look for. How will it appear on Microscope if a small crystal is glued.
Best regards
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Bob Harman March 26, 2017 09:30PM
In my opinion, using a microscope.....even a simple low power stereoscope.....looking for repairs and related tinkerings is most useful in miniatures, thumbnails, and similar small specimens. For any larger examples from small cabinet sized to larger specimens the microscope looses some of its usefulness. The microscope will be hard to focus and maneuver the larger specimens around simultaneously.
For these larger examples, I personally prefer using a flashlight, magnifying glass, and UV light. Most repairs or related tinkering with these larger examples will be exposed by carefully examining the specimen in these ways rather than using the microscope. CHEERS.....BOB
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Owen Lewis March 26, 2017 11:59PM
Agreed. A x10 triplet loupe is a much better tool for this purpose. Don't forget to combine its use with at least one or two different kinds of light source. For me, the basics are one diffused light that can flood a fair sized area of the surface as one time and another that will direct a collimated beam of light only a few mm wide and that you can manouevre about by hand. Be warned! Lights are addictive! I have over 13 sources at my last count and the number keeps nudging upwards :-)
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Gregg Little March 27, 2017 12:04AM
Fracture lines are usually fairly obvious under magnification and if glue is evident you should see amorphous material in the gap.
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Doug Daniels March 27, 2017 03:36AM
As has been mentioned, most common glues/adhesives will fluoresce under long-wave UV. Not gonna say all do, but likely most. And, you would likely see the adhesive as a layer, going from inside the crystal to the surface. A microscope is overkill, and not really useful for a large specimen.
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Alfredo Petrov March 27, 2017 03:45AM
Remember that for really big specimens, repairs are more or less expected, and the type of collectors who collect the big, famous, multi-million $$$ rocks aren't too worried about it. It's hard to impossible to get big things out of confined spaces underground without damaging them. Ironically, repairs have a lot more detrimental effect on the value of smaller cheaper specimens.
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Aqua marine March 27, 2017 08:59AM
thank u guyz.
i will have to check it with a loup . if i find something fishy, i will use acetone.
acetone has already saved me $10,000 a couple of months ago.

please add me to your facebook friends. your expertise and knowledge will be very handy if i need any information at real time.
my facebook id is Ali Mir
email : 14megapixel@gmail.com
profile pic is a nice aqua crystal

regards
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