So then, the hypothesis is the "berries" are formed by something precipitating into CO2 gas bubbles -
Two problems here.
First, the composition of the "berries" themselves. This forces the assumption that the precipitating fluid works only on hematite, and nothing else found in the Martian soil - a pretty magical fluid, it would appear -
Second is the uniform prefectly spherical shape of the berries. Here the gas bubbles are assumed to form perfectly spherically, and then chemical processes working under gravity, even one third gravity, are supposed to fill these perfectly spherical bubbles in uniformly.
In the case of Martian tectites, Mars' atmosphere is near a vacuum to start out with, so there should not be atmospheric deformation of tectites formed after impact. Second, Mars gravity is one third Earth's, which should lead to long dwell times for impact plasmas.
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Space/Science » in reply to re: Spherules are not concretions, as previously hypothesized
re: Spherules are not concretions, as previously hypothesized