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The mineralogy (wt %) of crystalline phases measured by CheMin, comparing Rocknest and Namib dunes (sample Gobabeb A). The estimated amorphous material content of both Gobabeb and Rocknest is 35% ± 15%. Data from Gobabeb are from Achilles et al. [2017]; data from Rocknest are from Achilles et al. [2017] as updated from Bish et al. [2013], using a new CheMin calibration.
