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 Post subject: Can Anyone Help with This Green Stone
PostPosted: Sun Feb 14, 2021 11:12 am 
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Hi
First of all thanks for reading this post

Can anyone help in identifying this gemstone

i am new to gemology but very keen to learn

here is what ive got so far

Magnetism = No or my magnet is weak
Specific Gravity= 1.25
Pleochroism= None
Spectrometer ( Non prism ) = looks like jadeite / nephrite
chelsea filter reaction = remains green
UV = no reaction
RI ( using digital refractometer) =1.545 - 1.578 = -0.033



Any help would be much appreciated


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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Sun Feb 14, 2021 1:47 pm 
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Adventurine maybe. Your SG reading doesn't look accurate 1.25?

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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Sun Feb 14, 2021 2:27 pm 
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glhays wrote:
Adventurine maybe. Your SG reading doesn't look accurate 1.25?


i used a home setup with a 1 decimal scale, i have ordered another and thanks for reply.


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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Sun Feb 14, 2021 2:31 pm 
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Adventurine maybe. Your SG reading doesn't look accurate 1.25?

I have ordered a scale to two decimal places and i will re-calculate / repost when the scales arrive.

thank you for your insight

much appreciated


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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Sun Feb 14, 2021 2:59 pm 
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Agree, it looks like Adventurine.

I doubt your tests are accurate or of much use.


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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Sun Feb 14, 2021 3:40 pm 
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1bwana1 wrote:
Agree, it looks like Adventurine.

I doubt your tests are accurate or of much use.



Anything online material or recommend any courses to make my results more accurate.


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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Sun Feb 14, 2021 3:45 pm 
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To the eye it does look like aventurine from those parallel green lines, but it looks like the color also follows cracks. Maybe a dyed stone like beryl with hollow growth tubes. This is where a microscope comes in really handy to get a better sense of exact inclusion nature and geometry.

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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Sun Feb 14, 2021 3:46 pm 
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Thank you


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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Sun Feb 14, 2021 8:02 pm 
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Like Steve stated in this posters opal post always dicy when you can't do the actual tests. It does look a little dyed and the RI range would kinda be either or.
Possibly not even being either.

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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Thu Feb 18, 2021 12:16 am 
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May I suggest, rmohamm1, that you get some stones that you know are properly identified.
Perhaps an amethyst, almandine garnet or synthetic, flame fusion spinel, a cheap blue topaz, etc.
Test them with your instruments.

You would already know the SG, RI, Spectra, Magnetic reaction. See if your instruments are giving you reliable results.


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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Thu Feb 18, 2021 12:24 am 
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Barbra Voltaire, FGG wrote:
May I suggest, rmohamm1, that you get some stones that you know are properly identified.
Perhaps an amethyst, almandine garnet or synthetic, flame fusion spinel, a cheap blue topaz, etc.
Test them with your instruments.

You would already know the SG, RI, Spectra, Magnetic reaction. See if your instruments are giving you reliable results.


This is the best idea yet. We are all pretty sure that the numbers you quote are wrong. This way you can figure out what you are doing wrong - or you can watch the videos Barbra references on how to do all things things.


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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Thu Feb 18, 2021 4:13 am 
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Will do thanks


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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Thu Feb 18, 2021 4:35 pm 
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Hi all

Update on specific gravity purchased a 0.00 g scale and got the following result for specific gravity ( 2.84 )

I have ordered a 0.000 scale which will be coming soon.

I believe this may be a green carnelian? It matches a few other pictures online.

What are your thoughts?


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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Thu Feb 18, 2021 7:37 pm 
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Carnelian is not green.
Polariscope reaction?


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 Post subject: Re: Can Anyone Help with This Green Stone
PostPosted: Fri Feb 19, 2021 12:54 am 
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Carnelian is a trade name for an agate type usually orangey brown. Lapidary speaking that is. :wink:

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