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. 2015 Aug 1;15(8):637–668. doi: 10.1089/ast.2014.1235

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Copyright 2015, Mary Ann Liebert, Inc.

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FIG. 3. — Iron-sulfate efflorescent salts on PQB rocks. All images were acquired with FEG-SEM. (a) SE image of tabular polygonal crystals identified as copiapite (Cp) group minerals by mineral morphology, (b) BSE image of tabular polygonal copiapite group mineral crystals associated with unidentified efflorescent iron-sulfate salts, (c) BSE image of bundled fibrous crystals of halotrichite (H) group minerals, identified by their distinct mineral morphology, are associated with euhedral crystals likely of copiapite group minerals. (d) BSE image of fibrous crystals of halotrichite group minerals and cryptic filaments (CF), (e) SE image of anhedral crystals of cemented silver- and sulfur-bearing particles, (f) BSE image of small (average=2.3 μm; N=20) smooth spheres of unidentified iron-sulfate salts in association with pyrite, (g) BSE image of tabular, polygonal copiapite group minerals associated with unidentified iron-sulfate salts.