What does RDX look like?
http://www.atsdr.cdc.gov/tfacts78.html<snip>
RDX stands for Royal Demolition eXplosive. It is also known as cyclonite or hexogen. The chemical name for RDX is 1,3,5-trinitro-1,3,5-triazine. It is a white powder and is very explosive.
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Why does this matter:
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UN weapons inspectors went repeatedly to the vast al Qa Qaa complex, most recently on March 8. But they found nothing during spot visits to some of the 1,100 buildings at the site 40 kilometres south of Baghdad.
Col. John Peabody, engineer brigade commander of the 3rd Infantry Division, said troops
found thousands of five-centimetre by 12-centimetre boxes, each containing three vials of white powder, together with documents written in Arabic that dealt with how to engage in chemical warfare.
A senior U.S. official familiar with initial testing said the powder was believed to be explosives. The finding would be consistent with the plant's stated production capabilities in the field of basic raw materials for explosives and propellants.
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http://www.globalsecurity.org/org/news/2003/030405-chem-readiness01.htm