Solution calorimetric determination of the enthalpies of formation of NH4-bearing minerals buddingtonite and tobelite by Guy L. Hovis,1 Daniel Harlov,2 and Matthias Gottschalk2(vol. 89, no. 1, pages 85–93, 2004).

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1

Department of Geology and Environmental Geosciences, Lafayette College, Easton, Pennsylvania 18042-1708, U.S.A.

2

GeoForschungsZentrum-Potsdam, Telegrafenberg, D-14473 Potsdam, Germany

The gram formula weights (gfw) of buddingtonite, tobelite, and salammoniac given in Hovis et al. (2004) are incorrect. This mistake, which also affected molar enthalpies of solution and formation, was generated on a spreadsheet used by the senior author to calculate the gfw values of...

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