Pyrite Psuedomorph - June 2012

June 2012.  I’m in Northwest Montana.  The rocks here are very old – some are over a billion years old.  There is a beautiful site where you can find limonite cubes.  These are pyrite pseudomorphs.  Originally, a cubic pyrite specimen formed.  Over time, however, the pyrite cube was replaced with a secondary mineral, limonite, which took the form of the pyrite cube.  I collected a nice specimen with a little help from mom and dad.    

MT Pyrite Psuedomorph in Matrix

Pyrite Pseudomorph in Belt Formation rock

MT Pyrite Psuedomorph

At last, a nice specimen is liberated

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