New Mineral Named After GIA’s John Koivula
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 Post subject: Edenite
PostPosted: Fri Oct 10, 2014 2:52 pm 
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I have a small parcel of Russian Edenite crystals which are decent sized and facet grade. The RI and hardness stats on this material look good, but I have never seen a cut stone. Has anyone else run across this material ?


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 Post subject: Re: Edenite
PostPosted: Fri Oct 10, 2014 3:07 pm 
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Edenite is an amphibole, one of the (many) end-members of hornblende. Not too many amphiboles form facet-grade crystals, though of course nephrite is a well-known gem species. Tremolite and richterite/winchite are two other examples which come in facet grades. I don't know how difficult tremolite is to facet but richterite is difficult according to a G&G article. My guess is that edenite would be more like tremolite than richterite, so it's probably not too terrible to cut.

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 Post subject: Re: Edenite
PostPosted: Fri Oct 10, 2014 3:16 pm 
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Tom,

which color? Sounds interesting....

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 Post subject: Re: Edenite
PostPosted: Fri Oct 10, 2014 3:45 pm 
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My Edenite rough is clear, maybe slightly green on white paper. I have some tremolite crystals that will cut some nice green stones, so I may try those first. What color is richterite?


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 Post subject: Re: Edenite
PostPosted: Fri Oct 10, 2014 4:04 pm 
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TOM KIDWELL wrote:
My Edenite rough is clear, maybe slightly green on white paper. I have some tremolite crystals that will cut some nice green stones, so I may try those first. What color is richterite?


Tremolite from Merelani?

Would be nice if you show a cut stone ( tremolite and edenite) here ( GO marketplace too :D )

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 Post subject: Re: Edenite
PostPosted: Fri Oct 10, 2014 4:57 pm 
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Facet-grade richterite is pale yellow. Pretty stuff, and interesting as a curiosity. I got an awesome deal on a small parcel of crystals--the coolest thing to me is that you can look inside the crystal and see the perfect 60-120 cleavage which is the trademark of the amphibole group.

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