Photo courtesy David Laird, USDA, ARS, National Soil Tilth Laboratory Ames IA. USA.
Soil smectite quasicrystal on aluminium foil. (SSSAm. J. 55:1499-1504).
From: Ap horizon, Webster soil, University of Minnesota Southern Agricultural Experiment Station, Waseca, MN.
Dimensions: Field of view approx. 90 microns wide
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