New Mineral Named After GIA’s John Koivula
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 Post subject: what do they have in common?
PostPosted: Sat Dec 22, 2012 11:17 am 
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Contest for experts!
These three gems, what do they have in common?
(not the particular stones in the picture but the gems they represent)

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 Post subject: Re: what do they have in common?
PostPosted: Sat Dec 22, 2012 3:58 pm 
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Hardness :D


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 Post subject: Re: what do they have in common?
PostPosted: Sat Dec 22, 2012 4:44 pm 
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I agree with Dr Bill.

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 Post subject: Re: what do they have in common?
PostPosted: Sat Dec 22, 2012 4:51 pm 
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Shouldnt we say softness here?

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 Post subject: Re: what do they have in common?
PostPosted: Sat Dec 22, 2012 5:14 pm 
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Nooo, it would be too easy! :D
Maybe you should start guessing what stones are there! :wink:

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 Post subject: Re: what do they have in common?
PostPosted: Sat Dec 22, 2012 5:28 pm 
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Apatite, Sphalerite and hmmm Baryte? (I know. Just guessing)

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 Post subject: Re: what do they have in common?
PostPosted: Sat Dec 22, 2012 5:42 pm 
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Apatite and sphalerite are correct! It wasn't too hard but congratulations anyway!
But the third one is not baryte!

Hint: if you use diamond tester with that stone, the reading will be the same as for diamond, but it's not a diamond!

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 Post subject: Re: what do they have in common?
PostPosted: Sun Dec 23, 2012 4:13 am 
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Phenakite ?


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 Post subject: Re: what do they have in common?
PostPosted: Sun Dec 23, 2012 5:00 am 
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YES! Good shot! =D>

Now, the second part of the game: What do they have in common? :?:

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 Post subject: Re: what do they have in common?
PostPosted: Sun Dec 23, 2012 8:14 am 
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Egor Gavrilenko wrote:
Now, the second part of the game: What do they have in common? :?:


The fact that I like 'em? :D

Besides that? All three are pleochroic...


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 Post subject: Re: what do they have in common?
PostPosted: Sun Dec 23, 2012 8:23 am 
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Sphalerite is not pleochroic. :wink:

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 Post subject: Re: what do they have in common?
PostPosted: Sun Dec 23, 2012 10:22 am 
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They are all transparent :lol: :lol: :lol:


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 Post subject: Re: what do they have in common?
PostPosted: Sun Dec 23, 2012 10:37 am 
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Oh, yes, of course they are, as the vast majority of gems!... :D
I'm afraid you have to go deeper!...

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 Post subject: Re: what do they have in common?
PostPosted: Sun Dec 23, 2012 10:49 am 
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Conchoidal fracture???

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 Post subject: Re: what do they have in common?
PostPosted: Sun Dec 23, 2012 11:00 am 
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Named because they are often mistaken with other stones


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