Close-up of the orange soil discovered on the <a href="https://en.wikipedia.org/wiki/Apollo_17" class="extiw" title="w:Apollo 17">Apollo 17</a> mission in 1972. The color is caused by microscopic glass beads created by volcanic processes earlier in the Moon's history.  This is NASA photo AS17-137-20986, <a href="//commons.wikimedia.org/wiki/File:Orange_Soil_Discovery_-_GPN-2000-001152.jpg" class="mw-redirect" title="File:Orange Soil Discovery - GPN-2000-001152.jpg">File:Orange Soil Discovery - GPN-2000-001152.jpg</a>.
National Aeronautics and Space Administration
1972-12
<a rel="nofollow" class="external free" href="http://history.nasa.gov/alsj/a17/images17.html">http://history.nasa.gov/alsj/a17/images17.html</a> (<a href="//commons.wikimedia.org/wiki/File:AS17-137-20986_(21497553029).jpg" title="File:AS17-137-20986 (21497553029).jpg">original file</a>)