Fig. 2.
SEM images of the natural Cuban (~ 3 µm) (a, b, c) and Mexican (~ 20–150 µm) (d, e, f) zeolites at different magnifications
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.