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Scanning electron microscope view of iron crystal

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Scanning electron microscope view of iron crystal

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Summary

A scanning electron microscope photograph of iron crystals which grow in a small vug or cavity in a recrystallized breccia (fragmented rock) from the Apollo 15 Hadley-Apennino lunar landing site. The largest crystal is three microns across. Perfectly developed crystals such as these indicate slow formation from a hot vapor as the rock was cooling. The crystals are resting on an interlocking lattice of pyroxene (calsium-magnesium-iron silicate).

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Date

10/11/1972
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Source

NASA
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Public Domain Dedication (CC0)

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apollo 15 flight
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