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Written by: Jim Beard
Monday July 7, 2014

July Microphoto of the Month

July Microphoto of the Month

This is a microphoto of a rock drilled from beneath the ocean floor 200 miles off the coast of Portugal. This is an igneous rock that formed as a molten magma cooled and crystallized. As it cooled, water dissolved in the magma began to react with minerals formed early on during crystallization. The early formed mineral is clinopyroxene (colorless). As it reacted with the magma, the edges of the clinopyroxene are eaten away and hornblende (the brown mineral) is formed. This kind of reaction texture is seen in many igneous rocks. The black mineral in the upper left and lower right is the iron-titanium mineral ilmenite.

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

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