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Written by: Jim Beard
Monday February 23, 2015

This crystal of plagioclase feldspar from the Mid-Atlantic Ridge that has been cut by several faults. The stripes in plagioclase are twins, rotated bits of crystal that formed as the mineral grew. Feldspar twins usually can’t be seen under normal light. However, the fault offset of the twins is obvious in this cross-polarized light photo.

February 2015 Microphoto of the Month

Tags: Dr. Jim Beard, Earth Science, Geology, Microphoto of the Month, Research and Collections

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