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Unid dk bn euhedral; no cleavage; Buckwheat Dump (NJ)

Posted by Modris Baum  
Unid dk bn euhedral; no cleavage; Buckwheat Dump (NJ)
February 22, 2012 07:37PM
us    
A couple of xls found on the Buckwheat Dump in 1995.

The first one can be seen by clicking the topic header at the top of the page. The other is at second example

Details are provided in the captions.

I'm thinking "dravite" because of the lack of cleavage. But I'm having a hard time reconciling the morphology with tourmaline.

Suggestions?

Thanks - Modris
Re: Unid dk bn euhedral; no cleavage; Buckwheat Dump (NJ)
February 22, 2012 08:49PM
Hi Modris, looks like a dark brown uvite from the looks of the termination and poikiolitic texture of broken crystals. It is very common to have the Franklin, NJ uvites incorporate the calcite into the crystals as they form. That's why you should not etch them out with acids.
Steve.
Re: Unid dk bn euhedral; no cleavage; Buckwheat Dump (NJ)
February 22, 2012 09:25PM
us    
Hi Steve,

Thanks! I was hoping you'd take a look.

Shows you how many uvites I've found at Franklin! At least you taught me to look at the cleavage from that last fiasco. So I was at least thinking tourmaline. But I still have trouble visualizing that second xl as a uvite ... I need to ponder Dunn's diagrams some more.

Anyway - thanks again

Modris
Re: Unid dk bn euhedral; no cleavage; Buckwheat Dump (NJ)
February 23, 2012 06:51PM
at    
Just wondering: is there any reliable published analysis of Franklin uvite?
Re: Unid dk bn euhedral; no cleavage; Buckwheat Dump (NJ)
February 23, 2012 07:08PM
us    
Hi Uwe,

According to the entry for uvite in Dunn's "Franklin and Sterling Hill, New Jersey ..." (p.425), 'Uvite was redefined and established by Dunn et al. in "Uvite, a new (old) common member of the tourmaline group and its implications for collectors" Meneralogical Record, 8, 100-108 (1977).

Perhaps Steve or Chet know of something more recent.

Modris
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