New Mineral Named After GIA’s John Koivula
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 Post subject: Re: what do they have in common?
PostPosted: Sun Dec 23, 2012 12:32 pm 
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Thomasset, you are the absolute winner of this contest, CONGRATULATIONS! =D> =D> =D>

Here is your

Image

The names of all three minerals come from different forms of "deceiver" because they were frequently confused with other minerals: apatite with beryl, phenakite with quartz and sphalerite with galena!

BTW, the same name is very appropriate for phenakite also because of it's behaviour on diamond tester! :wink:

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 Post subject: Re: what do they have in common?
PostPosted: Sun Dec 23, 2012 1:50 pm 
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I am honest:
I find phenakite with google images
I find the answer comparing the stones with classic gems
http://www.gemstonediscovery.com/
But I am glad. :)


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 Post subject: Re: what do they have in common?
PostPosted: Sun Dec 23, 2012 6:47 pm 
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Egor Gavrilenko wrote:
Sphalerite is not pleochroic. :wink:


Confused it with sphene :oops:


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 Post subject: Re: what do they have in common?
PostPosted: Mon Dec 24, 2012 11:32 pm 
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:lol: being a newbie we'll let you get away with that Michael.
You must check out Egor's web site now. 8)

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 Post subject: Re: what do they have in common?
PostPosted: Tue Dec 25, 2012 6:29 am 
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mehoose wrote:
:lol: being a newbie we'll let you get away with that Michael.

Narrow escape! :D
mehoose wrote:
You must check out Egor's web site now. 8)

Alright, I'll do my homework, on the next quiz I'll beat you all :mrgreen:


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 Post subject: Re: what do they have in common?
PostPosted: Wed Dec 26, 2012 12:35 pm 
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Alberto wrote:
Conchoidal fracture???


Alberto, I've broken many kilos of sphalerites for cutting and I've never seen conchoidal fracture on it... [-X
It's just impossible for mineral with perfect cleavage in six directions!... :wink:

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 Post subject: Re: what do they have in common?
PostPosted: Wed Dec 26, 2012 1:17 pm 
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good to know Egor, thx........someone should drop a note to Dr Bill........GTPro reports Sphalreites fracture as "conchoidal to uneven"..............

ciao and Feliz Navidad...............
albé

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 Post subject: Re: what do they have in common?
PostPosted: Wed Dec 26, 2012 3:34 pm 
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Egor Gavrilenko wrote:
Alberto, I've broken many kilos of sphalerites for cutting and I've never seen conchoidal fracture on it... [-X
It's just impossible for mineral with perfect cleavage in six directions!... :wink:

I agree: I've hammered many small pieces of sphalerite (not for gemological purposes...) to get as perfect cleavage planes as I could, and it was very easy. :D (on a second thought, I should have kept some pieces for faceting, but it was long before I started faceting: it was the light yellow one from Picos de Europa)
And also the black-ish sphalerite I mined from the mines here in Northern Italy once hammered shows nice cleavage planes. Not conchoidal at all.


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 Post subject: Re: what do they have in common?
PostPosted: Tue Mar 12, 2013 12:45 pm 
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Wow, it looks like we have one more gem for "deceivers" family - malaya garnet !!! :smt042

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Malaya [Pyrospessartite]

The name of this variety of the pyrope-spessartite series is not related in any way to the area of southeast Asia known as Malaya or its people. It is derived from the word of the Swahili tribe in Africa meaning prostitute. Joel Arem in the Color Encyclopedia of Gemstones attributes it to the Bantu tribe word for “outside the family” or “deceiver”. According to unconfirmed reports, miners, frustrated in their search for a different mineral and disgusted by the frequent presence of such a similar material, bestowed the unflattering name on the similar substance. The sources in Africa provided the name, but, perhaps, the use of the term pyrospessartite combined with the designation of the place of origin, Tanzania, would create less confusion.


Quoted from: http://www.attawaygems.com/NMFG/Lets_ta ... pites.html

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 Post subject: Re: what do they have in common?
PostPosted: Thu Aug 01, 2013 10:17 pm 
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Alberto wrote:
good to know Egor, thx........someone should drop a note to Dr Bill........GTPro reports Sphalreites fracture as "conchoidal to uneven"..........


OK, I don't get out much (it only took me 7 months to find this). I name my source for the misinformation in GT Pro about Sphalerite fracture as GIA's Gem Reference Guide (copyright 1988 - maybe that's why). I'll fix this in the next release.

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 Post subject: Re: what do they have in common?
PostPosted: Fri Aug 02, 2013 3:10 am 
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GTP Bill wrote:

OK, I don't get out much (it only took me 7 months to find this).


my bad Bill, i should have pointed out to you by a pm, I apologize.....

ciao
alberto

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 Post subject: Re: what do they have in common?
PostPosted: Fri Aug 02, 2013 6:10 am 
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No problem, Alberto.
It's not your responsibility to keep me up to date.

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 Post subject: Re: what do they have in common?
PostPosted: Fri Aug 02, 2013 6:39 am 
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GTP Bill wrote:
No problem, Alberto.
It's not your responsibility to keep me up to date.


maybe, but it would have been kind on my side.... :roll: :D

ciao
albé

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