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128 microns is about one-tenth as long as a Grain of Sand
In other words, it's 0.102 times the length of a Grain of Sand, and the length of a Grain of Sand is 9.8 times that amount.
(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 1,250 microns. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15,100,000 microns in height.
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