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Written by: Jim Beard
Friday October 24, 2014

Zoned hornblende, Mid-Atlantic Ridge.  The brown, titanium-rich hornblende in the core of the crystal crystallized from a magma at high temperature, between 900 and 1000 degrees celsius.  As the magma cooled and changed composition, the titanium-poor, tan-colored hornblende crystallized at the rim of the crystal.  The straight line contacts between the brown and tan hornblende are crystal faces.  They crystal is approximately 2 mm in length.

October Microphoto of the Month

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