The samples come from a small sand bar. One side of the sand bar contained pebbles, the other sand.
International Space Station 400mm Photograph
Image credit: Image Science and Analysis Laboratory, NASA Johnson Space Center (http://eol.jsc.nasa.gov)
GRANT PARK, SO. MILWAUKEE 42.92N, 87.85W
The link is to a photo essay of a trail in Grant Park.
ZERO MAGNIFICATION ( YELLOW LINE = 1 CM)
ZERO MAGNIFICATION IMAGE
REFLECTANCE SPECTRUM
1X* MAGNIFICATION (YELLOW LINE = 2MM)
3X* MAGNIFICATION (YELLOW LINE = 1MM)
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