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 Post subject: dichroic Grandiderite Update, new pics
PostPosted: Sat Jul 27, 2019 11:08 am 
Heres 2 terrible pics of the 9.4 mm Grandiderite I just finished. I noticed it is strongly, or is it weakly, dichroic, from green to yellow green.


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Last edited by nickatnight on Sun Jul 28, 2019 3:24 am, edited 1 time in total.
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 Post subject: Re: dichroic Grandiderite
PostPosted: Sat Jul 27, 2019 12:28 pm 
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Nice. If I remember correctly it is strongly trichroic, not dichroic.


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 Post subject: Re: dichroic Grandiderite
PostPosted: Sat Jul 27, 2019 3:01 pm 
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Sorry for this question but is this really Grandidierite?

The color (green to yellow green) doesn’t speak for grandidierite which is bluishgreen to green blue and orthorhombic.

Maybe tourmaline?

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 Post subject: Re: dichroic Grandiderite
PostPosted: Sat Jul 27, 2019 6:10 pm 
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I'd be happy to test it for you nickatnight.


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 Post subject: Re: dichroic Grandiderite
PostPosted: Sun Jul 28, 2019 3:21 am 
Here are pics of all my rough, and also the second one cut. Tried to show the inclusions. Its 8.4mm, 2.5 ct.
Haven't had any trouble from the cleavage planes. Polishes very fast with 50k diamond.
Unlike anything I have cut before. Very easy to cut. Predictable.
Looks nothing like tourmaline. Several ebay sellers have this stuff now, probably from a new deposit recently found.
And yes, I sure wish it was blue.
Barb, when I break out my saw I will cut some small ones and send some your way.
A couple of the rough hold many very clear pieces, but need to be sliced apart.


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 Post subject: Re: dichroic Grandiderite Update, new pics
PostPosted: Sun Jul 28, 2019 8:43 am 
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Good idea to send some to Barbra to check what it is.

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 Post subject: Re: dichroic Grandiderite Update, new pics
PostPosted: Mon Jul 29, 2019 12:03 am 
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It's my pleasure.
Just a small piece should do. Flat surface...and you's be a saint if you polished that flat surface. :wink:


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 Post subject: Re: dichroic Grandiderite Update, new pics
PostPosted: Mon Jul 29, 2019 5:06 am 
will do Barb, might be a couple weeks tho, kinda busy right now.


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 Post subject: Re: dichroic Grandiderite Update, new pics
PostPosted: Mon Jul 29, 2019 1:09 pm 
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Take your time.
I'm not going anywhere.


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