Scanning Electron Microscope View of Iron Crystal

Magnified view of iron crystals. Each has several flat faces. They look light grey, and the edges catch the light.
Historical DateNovember 10, 1972
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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).