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. Author manuscript; available in PMC: 2011 Jun 29.
Published in final edited form as: Environ Sci Technol. 2011 Mar 17;45(8):3768–3773. doi: 10.1021/es1040688

Figure 2.

Figure 2

SEM images using 30 kV, 2.1 nA current, (A) Clay particles on graphite (dark substrate). EDS (right) shows elements over a rastered area, (B) Close up of Fe–S spherules in aluminosilicate matrix. EDS spectrum is rastered over spherules, (C) Lath shaped particle with high Ca, S, and O (black dot) interpreted as gypsum or jarosite.