[meteorite-list] Questions about Uruacu - Shiny Black Inclusions / Images / Etching

[David & Kitt Deyarmin]

I am processing some Uruacu and some of the pieces have huge shiny black 
inclusions that almost have a mirror like reflective surface.

Does anyone know what these are, you can see a lot of them in this 354 gram 
slice:


http://i131.photobucket.com/albums/p298/BobaDebt/Uruacu/354grSlice1.jpg



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Does anyone have any tips on photographing this material.  It doesn't have a 
lot of contrast but the etch looks 1000% better then what this image shows:

http://i131.photobucket.com/albums/p298/BobaDebt/Uruacu/354grSlice2.jpg

I have tried shooting it from various angles, with and with out flash, 
inside, outside, nothing seems to really capture the look of the etch



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Speaking of the etch, does anyone have any ideas on how to get more 
contrast, I have tried a variety of Nitric Acid and Ferric Chloride 
Solutions and I have even tried various combination of both.

If anyone can offer any help it would be greatly appreciated.

Thanks