International Space Station 80mm Photograph

Image credit:  Image Science and Analysis Laboratory, NASA Johnson Space Center (http://eol.jsc.nasa.gov)

GLACIAL SAND, FITCHBURG - 42.58N, 71.80W

The link is to the Wikipedia page on Fitchburg.

ZERO MAGNIFICATION IMAGE

REFLECTANCE SPECTRUM

1X* MAGNIFICATION (BLACK LINE  = 2MM)

3X* MAGNIFICATION (BLACK LINE  = 1MM)