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7.09 carat in microlite gem?

microlite 1
0 (0%)
microlite 2
3 (100%)

Total Members Voted: 3

Author Topic: Microlite Gem? 7.09carat?that's possible?  (Read 2602 times)

clad

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Microlite Gem? 7.09carat?that's possible?
« on: July 18, 2012, 12:27:31 AM »
Hello

I have this gem, after a few test with my gemology tools the result was this:
I never found a Microlite of 7.09 carat. I dont know if this can be possible.

RI index : 2.050
Specific Gravity : 5.61
Single Refraction
VVS / sparkling
Carat 7.09

Any help please

[attachment deleted by admin]
« Last Edit: July 18, 2012, 12:34:34 AM by clad »

The Rock Hunter

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Re: Microlite Gem? Any help in this gem
« Reply #1 on: July 18, 2012, 12:28:47 AM »
very nice stone :D sory have no idea not a facetor yet any way welcome clad to ALF  beers :D 8) :o beers    :-\
« Last Edit: July 18, 2012, 12:50:18 AM by Rock Hunter »
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fossickeract

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Re: Microlite Gem? Any help in this gem
« Reply #2 on: July 18, 2012, 12:32:46 AM »
   Man made cubic zirconia SG fits RI close microlite is descibed as microscopic translucent to opaque crystals although it does fit the SG and RI.
« Last Edit: July 18, 2012, 12:43:59 AM by fossickeract »
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Capt. Mendoza

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Re: Microlite Gem? 7.09carat?that's possible?
« Reply #3 on: July 18, 2012, 12:47:24 AM »
it certainly has a lot of fire...!
8)  www.JewelleryPirate.com.au/blog - The Jewellery Pirate's fossicking adventures...

clad

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Re: Microlite Gem? 7.09carat?that's possible?
« Reply #4 on: July 18, 2012, 12:48:53 AM »
Hello

before i make the test 3 gemologyst of more than 15 years of experience view this gem and all of the said that is not a cubic zirconia, the result was, they dont know (LOL).

Then i test the gem by myself, and i found that match with a rare gem earth (Microlite) in this site, there are many others.

http://www.realgems.org/list_of_gemstones/microlite.html

fossickeract

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Re: Microlite Gem? 7.09carat?that's possible?
« Reply #5 on: July 18, 2012, 01:02:03 AM »
 Bit difficult to test the hardness but you should be able to find Na/Ca absorption lines using a spectroscope if it was Microlite. Also see it might be slightly radioactive!
« Last Edit: July 18, 2012, 01:33:55 AM by fossickeract »
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Findem

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Re: Microlite Gem? 7.09carat?that's possible?
« Reply #6 on: July 18, 2012, 08:22:04 AM »
I have to confess that I've never heard of a mineral called microlite. Perhaps it has been discovered since I studied mineralogy (many years ago). Where is it found?

Lawrence

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Re: Microlite Gem? 7.09carat?that's possible?
« Reply #7 on: July 18, 2012, 11:48:15 AM »
I always love a good puzzle.

What method did you use to determine the RI?

What test did the gemologists perform to discount CZ?

Do you have a SWUV light source?

Man made Cubic Zirconia fits the data you have provided.

You mention VVS, what kind of inclusions can you see under magnification? Negative crystals, guest crystals, air bubbles?

Sadly, while microlite may fit, it is a long way from the most likely outcome, even heavily doped silica glass can fit the SG and RI.

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calxoddity

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Re: Microlite Gem? 7.09carat?that's possible?
« Reply #8 on: July 18, 2012, 12:51:41 PM »
I notice you haven't mentioned the hardness anywhere - what hardness is it?

scratchie

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Re: Microlite Gem? 7.09carat?that's possible?
« Reply #9 on: July 19, 2012, 09:47:37 AM »
Calxoddity,
Re getting a measurement of hardness
Almost impossible to test a faceted stone unlss you're prepared to damage it a little
John

chookie2

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Re: Microlite Gem? 7.09carat?that's possible?
« Reply #10 on: July 19, 2012, 12:11:08 PM »
Findem,
 Microlite is listed in Dana 1959 as being an ore of  tantalum, Microcline and albite- mainly found in Brazil apparently. Ca2 Ta2 O7. hardness 5.5.
Happy Fossicking from Chookie

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My rocks are gneiss, don’t take them for granite.

Findem

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Re: Microlite Gem? 7.09carat?that's possible?
« Reply #11 on: July 19, 2012, 03:15:01 PM »
Thanks Chookie. I see too that it's a pegmatite mineral. I should have consulted my Dana before commenting.  :D

chookie2

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Re: Microlite Gem? 7.09carat?that's possible?
« Reply #12 on: July 20, 2012, 10:54:50 AM »
It seems that most good gems are originally from pegmatites- just how and where is the big question. beers
Happy Fossicking from Chookie

Geology Rocks, I really dig it.
My rocks are gneiss, don’t take them for granite.

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