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. 2022 May 3;49(5):14. doi: 10.1007/s00269-022-01183-9

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© The Author(s) 2022, corrected publication 2022

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Fig. 2 — Exemplary BSE images of cracks emanating from a polished (010) surface (horizontal traces at the bottom of the images) of alkali feldspar after cation exchange for 2 days (top panel) 5 days (middle panel), and 12 days (bottom panel). The slightly darker grey shades along the cracks reflect a local enrichment in Na and depletion in K of the feldspar in the immediate vicinity of the cracks. The sub-horizontal cracks following the (010) cleavage of the feldspar and some other cracks are devoid of Na-rich halos indicating that they formed either during quenching or during preparation of the cross sections