Erratum to: Composition of weathering crusts on sandstones from natural outcrops and architectonic elements in an urban environment

Erratum to: Environ Sci Pollut Res (2014) 21:14023–14036

DOI 10.1007/s11356-014-3312-y

The original publication of this article contains a mistake. The correct image for Fig. 7 is shown below:

Fig. 7.

Microphotographs: sandstone from natural outcrops—a outer layer covered by ferruginous compounds (sample SMC-14, 1P), b iron oxides between mineral grains (sample SMC-12, 1P), and c iron compounds occurring in cleavage fissures of feldspar (sample SMC-14, XP); sandstone from architectonic detail—d black crust composed of gypsum covering the outer layer of the detail (sample MC-001, 1P), e gypsum crystals filling pores and cracks, replacing stone cement (sample MC-001, 1P), and f gypsum filling cleavage on feldspar (sample MC-011, XP). Optical microscope, thin sections cut perpendicular to the stone surface. 1P one polar, XP crossed polars