Rock Picture of the Week

This site is dedicated to the promotion and enjoyment of rockhounding which includes rock, mineral, and fossil hunting, collecting, and their related activities. Each week I will post a new subject related picture and description.

This weeks picture 6/28/09      Phlogopite
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Photo by Jim Bryan

From the private collection of Mike & Chris Whittier of Rocks in a Hard Place.

Phlogopite (KMg3(Si3Al)O10(F,OH)2) is sometimes known as magnesium mica. The color can be yellow, greenish, or red-brown (as in this specimen).
It has many of the physical characteristics of Biotite and, as the iron content increases, grades into it..


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All background photos by Jim Bryan