Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(A) An aggregate of dusts containing many elements, including iron, titanium, zinc and copper (EDX spectrum). Some ultra-fine PM of baryte are also visible (brighter spots). (B) A bright PM containing iron and manganese.
