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

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

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.

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

Just wondering: is there any reliable published analysis of Franklin uvite?

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