“…Emphasis has been placed on the importance of micro- to nanoscale investigations for disentangling the intricacies of microbially-mediated or abiotically-driven weathering mechanisms 17 , 18 , particularly in complex ecosystems where laboratory studies do not reproduce the extent of weathering that occurs in soils 19 . Microorganisms catalyze mineral weathering and silicate glass alteration to varying extents 20 – 23 , yet it remains unclear to what degree biological weathering processes transform volcanic glass and basaltic minerals 24 , 25 . Laboratory studies examining the relative influence of abiotic and biotic constituents on basalt dissolution report a number of realizations that include: (1) greater rates of basalt dissolution in the presence of bacteria where the degree of weathering also varied with the bulk elemental compositions of the volcanic glasses 26 , 27 ; (2) the enhanced release of Zr, Sc, Mn, Fe, Ti, Si/Al, and Si/Fe from basalt in the presence of organic acids, citrate, and dissolved organic matter extracts from Ponderosa Pine forest soil organic horizons 28 , 29 ; and (3) the important role of biofilms in producing contrasting secondary weathering products under abiotic versus biotic conditions 24 .…”