An official website of the United States government
Here’s how you know
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.
Mckeown, D.
, Bell, M.
and Etz, E.
(1999),
Raman Spectra and Vibrational Analysis of the Trioctahedral Mica Phlogopite, American Mineralogist
(Accessed December 3, 2023)