CIBJO releases Gemmological Special Report: considers process of separating measurable facts from opinion; See Gemological Articles below.
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 Post subject: a strange material
PostPosted: Thu Dec 27, 2018 6:41 am 
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Looks nice, looks like lapis lazuli or larimar.


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 Post subject: Re: a strange material
PostPosted: Fri Dec 28, 2018 2:19 am 
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Cool. It's definitely not lapis or larimar as I'm sure you know, but it does have some interesting form to it. Is it something you've spotted locally? I wonder what it could be.

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 Post subject: Re: a strange material
PostPosted: Fri Dec 28, 2018 6:35 am 
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I don't know what it is. But i am sure it is a natural material from Toliara, Madagascar


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 Post subject: Re: a strange material
PostPosted: Fri Dec 28, 2018 8:49 pm 
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Kinda reminded me of Mossy Creek Glassy Furnace Slag or Leland Blue.

With a little research I discovered the Molo Graphite Project, Green Giant Project and the Toliara Mineral Sands Project all of which have active refineries in Toliara, Madigascar.

Possible blue slag?


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 Post subject: Re: a strange material
PostPosted: Sat Jan 05, 2019 7:23 pm 
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I wonder if the cabochons have just a blue skin, like the rough pieces do, or if they're blue through and through?

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 Post subject: Re: a strange material
PostPosted: Sat Jan 05, 2019 7:44 pm 
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Jason Barrett wrote:
I wonder if the cabochons have just a blue skin, like the rough pieces do, or if they're blue through and through?

The rough appears to have a tan skin over solid blue.
The patterning doesn't have the wavy flow lines I think of in leland blue. But it is odd.

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 Post subject: Re: a strange material
PostPosted: Fri Jan 11, 2019 3:40 am 
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another photo


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 Post subject: Re: a strange material
PostPosted: Sat Jan 12, 2019 1:59 pm 
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I suggest you break off a small bit and send it to Stephen for a once over.


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 Post subject: Re: a strange material
PostPosted: Thu Jan 17, 2019 12:38 pm 
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Start with some basic tests, H, SG, reaction to acids. Do you know anything about exactly where it came from? Any pieces with matrix or associated minerals?


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