Dry [Fe/2=(SO4)/3] sold as the 700 mesh powder is about .035/H2O. As Morton Chemical distributes it pelletized to water purification companies and waste treatment utilities, it has been compacted to about 1.025/H2O.
This chemical can be compacted to 7.920/H2O but before it becomes useful as a chemical it must be returned to its 700 mesh state.
Wikipedia gives 3.097 g/cm3 (anhydrous)
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