This image may look like an unfamiliar rubble pile from an Ancient Aztec pyramid, but it is something much more common. You’ve seen it before. What is this?
Answer: a closeup of fine salt as seen by an electron microscope.
This and more rarely seen images at an article on MetNews
The image (public) above of “fine salt” (NaCl, sodium chloride or table salt, I assume) was taken with a scanning electron microscope on at 2:19 pm on September 17, 2013 at Western University UWO, Canada nanofab.uwo.ca.
Table salt is white, even close up, but electron microscopy does not show objects in natural light.