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 7/20/08      Pyrite

Mineral
Field Test

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Photo by Jim Bryan

This specimen is on display at the California State Mining and Mineral Museum in Mariposa, CA.

Pyrite (FeS2)   Commonly called "Fool's Gold" because of it's brassy yellow color, it is easily distinguished from gold by its hardness and lack of malleability. On the other hand, it is often an ore source for gold.
It is very common and can be found in many different types of rock formations.
This specimen has cubes measuring more than 2 inches per side. 

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All background photos by Jim Bryan