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 Post subject: Opal SG in The Gemology Project
PostPosted: Mon Feb 20, 2012 8:33 am 
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Joined: Sat May 21, 2011 7:09 am
Posts: 57
Location: Italy
Hello,

looking "opal" in The Gemology Project (http://www.gemologyproject.com/wiki/ind ... title=Opal), it is reported that specific gravity is 2.15 (+0.07;-0.90).

It means 1,25 to 2,27.

Check on other sites, they report about 1,98 to 2,25.

Is it the value 1,25 in The Gemology Project too small?
I think it is a mistake.


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 Post subject: Re: Opal SG in The Gemology Project
PostPosted: Mon Feb 20, 2012 8:57 am 
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Joined: Fri May 12, 2006 11:24 am
Posts: 7126
Location: Rome, Italy
75TURBO wrote:
(+0.07;-0.90).


i think a swap typo between "0" and "9" has occurred.......
thank you for reporting that...
OTOH the same -0.90 value is reported on the GTpro software AND on "tables of gemstone identification" by Brigit Gunther though...... :roll: ..........."tables of gemstone identification" by Roger Dedeyne reports 1.95-2.25 values......
ciao
alberto

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 Post subject: Re: Opal SG in The Gemology Project
PostPosted: Mon Feb 20, 2012 10:50 am 
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Joined: Sat May 21, 2011 7:09 am
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Location: Italy
I have a stone "like-an- opal" with SG = 1,9 (or better, between 1,87 to 1,92).

Could be it a nice stone or a fake opal ? #-o


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 Post subject: Re: Opal SG in The Gemology Project
PostPosted: Mon Feb 20, 2012 11:33 am 
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Joined: Sun Oct 16, 2005 12:22 pm
Posts: 14532
Location: San Francisco
There are several typos in The Gemology Project.
Join and fix them.
:D


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